chrome/browser/extensions/extension_system_impl.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/browser/extensions/extension_system_impl.h"
   6
   7 #include "base/base_switches.h"
   8 #include "base/bind.h"
   9 #include "base/command_line.h"
  10 #include "base/files/file_path.h"
  11 #include "base/memory/weak_ptr.h"
  12 #include "base/metrics/field_trial.h"
  13 #include "base/metrics/histogram.h"
  14 #include "base/strings/string_tokenizer.h"
  15 #include "base/strings/string_util.h"
  16 #include "chrome/browser/browser_process.h"
  17 #include "chrome/browser/content_settings/cookie_settings.h"
  18 #include "chrome/browser/extensions/component_loader.h"
  19 #include "chrome/browser/extensions/declarative_user_script_manager.h"
  20 #include "chrome/browser/extensions/error_console/error_console.h"
  21 #include "chrome/browser/extensions/extension_error_reporter.h"
  22 #include "chrome/browser/extensions/extension_management.h"
  23 #include "chrome/browser/extensions/extension_service.h"
  24 #include "chrome/browser/extensions/extension_system_factory.h"
  25 #include "chrome/browser/extensions/extension_util.h"
  26 #include "chrome/browser/extensions/install_verifier.h"
  27 #include "chrome/browser/extensions/navigation_observer.h"
  28 #include "chrome/browser/extensions/shared_module_service.h"
  29 #include "chrome/browser/extensions/shared_user_script_master.h"
  30 #include "chrome/browser/extensions/state_store_notification_observer.h"
  31 #include "chrome/browser/extensions/unpacked_installer.h"
  32 #include "chrome/browser/profiles/profile.h"
  33 #include "chrome/browser/profiles/profile_manager.h"
  34 #include "chrome/browser/ui/webui/extensions/extension_icon_source.h"
  35 #include "chrome/common/chrome_switches.h"
  36 #include "chrome/common/chrome_version_info.h"
  37 #include "chrome/common/extensions/extension_constants.h"
  38 #include "chrome/common/extensions/features/feature_channel.h"
  39 #include "content/public/browser/browser_thread.h"
  40 #include "content/public/browser/url_data_source.h"
  41 #include "extensions/browser/content_verifier.h"
  42 #include "extensions/browser/content_verifier_delegate.h"
  43 #include "extensions/browser/event_router.h"
  44 #include "extensions/browser/extension_pref_store.h"
  45 #include "extensions/browser/extension_pref_value_map.h"
  46 #include "extensions/browser/extension_pref_value_map_factory.h"
  47 #include "extensions/browser/extension_prefs.h"
  48 #include "extensions/browser/extension_registry.h"
  49 #include "extensions/browser/info_map.h"
  50 #include "extensions/browser/lazy_background_task_queue.h"
  51 #include "extensions/browser/management_policy.h"
  52 #include "extensions/browser/quota_service.h"
  53 #include "extensions/browser/runtime_data.h"
  54 #include "extensions/browser/state_store.h"
  55 #include "extensions/common/constants.h"
  56 #include "extensions/common/extension.h"
  57 #include "extensions/common/extension_urls.h"
  58 #include "extensions/common/extensions_client.h"
  59 #include "extensions/common/manifest.h"
  60 #include "extensions/common/manifest_url_handlers.h"
  61 #include "net/base/escape.h"
  62
  63 #if defined(ENABLE_NOTIFICATIONS)
  64 #include "chrome/browser/notifications/desktop_notification_service.h"
  65 #include "chrome/browser/notifications/desktop_notification_service_factory.h"
  66 #include "ui/message_center/notifier_settings.h"
  67 #endif
  68
  69 #if defined(OS_CHROMEOS)
  70 #include "chrome/browser/app_mode/app_mode_utils.h"
  71 #include "chrome/browser/chromeos/extensions/device_local_account_management_policy_provider.h"
  72 #include "chrome/browser/chromeos/policy/device_local_account.h"
  73 #include "chrome/browser/extensions/extension_assets_manager_chromeos.h"
  74 #include "chromeos/chromeos_switches.h"
  75 #include "chromeos/login/login_state.h"
  76 #include "components/user_manager/user.h"
  77 #include "components/user_manager/user_manager.h"
  78 #endif
  79
  80 using content::BrowserThread;
  81
  82 namespace {
  83
  84 const char kContentVerificationExperimentName[] =
  85     "ExtensionContentVerification";
  86
  87 }  // namespace
  88
  89 namespace extensions {
  90
  91 //
  92 // ExtensionSystemImpl::Shared
  93 //
  94
  95 ExtensionSystemImpl::Shared::Shared(Profile* profile)
  96     : profile_(profile) {
  97 }
  98
  99 ExtensionSystemImpl::Shared::~Shared() {
 100 }
 101
 102 void ExtensionSystemImpl::Shared::InitPrefs() {
 103   lazy_background_task_queue_.reset(new LazyBackgroundTaskQueue(profile_));
 104   event_router_.reset(new EventRouter(profile_, ExtensionPrefs::Get(profile_)));
 105   // Two state stores. The latter, which contains declarative rules, must be
 106   // loaded immediately so that the rules are ready before we issue network
 107   // requests.
 108   state_store_.reset(new StateStore(
 109       profile_,
 110       profile_->GetPath().AppendASCII(extensions::kStateStoreName),
 111       true));
 112   state_store_notification_observer_.reset(
 113       new StateStoreNotificationObserver(state_store_.get()));
 114
 115   rules_store_.reset(new StateStore(
 116       profile_,
 117       profile_->GetPath().AppendASCII(extensions::kRulesStoreName),
 118       false));
 119
 120 #if defined(OS_CHROMEOS)
 121   const user_manager::User* user =
 122       user_manager::UserManager::Get()->GetActiveUser();
 123   policy::DeviceLocalAccount::Type device_local_account_type;
 124   if (user && policy::IsDeviceLocalAccountUser(user->email(),
 125                                                &device_local_account_type)) {
 126     device_local_account_management_policy_provider_.reset(
 127         new chromeos::DeviceLocalAccountManagementPolicyProvider(
 128             device_local_account_type));
 129   }
 130 #endif  // defined(OS_CHROMEOS)
 131 }
 132
 133 void ExtensionSystemImpl::Shared::RegisterManagementPolicyProviders() {
 134   management_policy_->RegisterProviders(
 135       ExtensionManagementFactory::GetForBrowserContext(profile_)
 136           ->GetProviders());
 137
 138 #if defined(OS_CHROMEOS)
 139   if (device_local_account_management_policy_provider_) {
 140     management_policy_->RegisterProvider(
 141         device_local_account_management_policy_provider_.get());
 142   }
 143 #endif  // defined(OS_CHROMEOS)
 144
 145   management_policy_->RegisterProvider(install_verifier_.get());
 146 }
 147
 148 namespace {
 149
 150 class ContentVerifierDelegateImpl : public ContentVerifierDelegate {
 151  public:
 152   explicit ContentVerifierDelegateImpl(ExtensionService* service)
 153       : service_(service->AsWeakPtr()), default_mode_(GetDefaultMode()) {}
 154
 155   ~ContentVerifierDelegateImpl() override {}
 156
 157   Mode ShouldBeVerified(const Extension& extension) override {
 158 #if defined(OS_CHROMEOS)
 159     if (ExtensionAssetsManagerChromeOS::IsSharedInstall(&extension))
 160       return ContentVerifierDelegate::ENFORCE_STRICT;
 161 #endif
 162
 163     if (!extension.is_extension() && !extension.is_legacy_packaged_app())
 164       return ContentVerifierDelegate::NONE;
 165     if (!Manifest::IsAutoUpdateableLocation(extension.location()))
 166       return ContentVerifierDelegate::NONE;
 167
 168     if (!ManifestURL::UpdatesFromGallery(&extension)) {
 169       // It's possible that the webstore update url was overridden for testing
 170       // so also consider extensions with the default (production) update url
 171       // to be from the store as well.
 172       GURL default_webstore_url = extension_urls::GetDefaultWebstoreUpdateUrl();
 173       if (ManifestURL::GetUpdateURL(&extension) != default_webstore_url)
 174         return ContentVerifierDelegate::NONE;
 175     }
 176
 177     return default_mode_;
 178   }
 179
 180   const ContentVerifierKey& PublicKey() override {
 181     static ContentVerifierKey key(
 182         extension_misc::kWebstoreSignaturesPublicKey,
 183         extension_misc::kWebstoreSignaturesPublicKeySize);
 184     return key;
 185   }
 186
 187   GURL GetSignatureFetchUrl(const std::string& extension_id,
 188                             const base::Version& version) override {
 189     // TODO(asargent) Factor out common code from the extension updater's
 190     // ManifestFetchData class that can be shared for use here.
 191     std::vector<std::string> parts;
 192     parts.push_back("uc");
 193     parts.push_back("installsource=signature");
 194     parts.push_back("id=" + extension_id);
 195     parts.push_back("v=" + version.GetString());
 196     std::string x_value =
 197         net::EscapeQueryParamValue(JoinString(parts, "&"), true);
 198     std::string query = "response=redirect&x=" + x_value;
 199
 200     GURL base_url = extension_urls::GetWebstoreUpdateUrl();
 201     GURL::Replacements replacements;
 202     replacements.SetQuery(query.c_str(), url::Component(0, query.length()));
 203     return base_url.ReplaceComponents(replacements);
 204   }
 205
 206   std::set<base::FilePath> GetBrowserImagePaths(
 207       const extensions::Extension* extension) override {
 208     return ExtensionsClient::Get()->GetBrowserImagePaths(extension);
 209   }
 210
 211   void VerifyFailed(const std::string& extension_id,
 212                     ContentVerifyJob::FailureReason reason) override {
 213     if (!service_)
 214       return;
 215     ExtensionRegistry* registry = ExtensionRegistry::Get(service_->profile());
 216     const Extension* extension =
 217         registry->GetExtensionById(extension_id, ExtensionRegistry::ENABLED);
 218     if (!extension)
 219       return;
 220     Mode mode = ShouldBeVerified(*extension);
 221     if (mode >= ContentVerifierDelegate::ENFORCE) {
 222       service_->DisableExtension(extension_id, Extension::DISABLE_CORRUPTED);
 223       ExtensionPrefs::Get(service_->profile())
 224           ->IncrementCorruptedDisableCount();
 225       UMA_HISTOGRAM_BOOLEAN("Extensions.CorruptExtensionBecameDisabled", true);
 226       UMA_HISTOGRAM_ENUMERATION("Extensions.CorruptExtensionDisabledReason",
 227           reason, ContentVerifyJob::FAILURE_REASON_MAX);
 228     } else if (!ContainsKey(would_be_disabled_ids_, extension_id)) {
 229       UMA_HISTOGRAM_BOOLEAN("Extensions.CorruptExtensionWouldBeDisabled", true);
 230       would_be_disabled_ids_.insert(extension_id);
 231     }
 232   }
 233
 234   static Mode GetDefaultMode() {
 235     base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
 236
 237     Mode experiment_value = NONE;
 238     const std::string group = base::FieldTrialList::FindFullName(
 239         kContentVerificationExperimentName);
 240     if (group == "EnforceStrict")
 241       experiment_value = ContentVerifierDelegate::ENFORCE_STRICT;
 242     else if (group == "Enforce")
 243       experiment_value = ContentVerifierDelegate::ENFORCE;
 244     else if (group == "Bootstrap")
 245       experiment_value = ContentVerifierDelegate::BOOTSTRAP;
 246
 247     // The field trial value that normally comes from the server can be
 248     // overridden on the command line, which we don't want to allow since
 249     // malware can set chrome command line flags. There isn't currently a way
 250     // to find out what the server-provided value is in this case, so we
 251     // conservatively default to the strictest mode if we detect our experiment
 252     // name being overridden.
 253     if (command_line->HasSwitch(switches::kForceFieldTrials)) {
 254       std::string forced_trials =
 255           command_line->GetSwitchValueASCII(switches::kForceFieldTrials);
 256       if (forced_trials.find(kContentVerificationExperimentName) !=
 257               std::string::npos)
 258         experiment_value = ContentVerifierDelegate::ENFORCE_STRICT;
 259     }
 260
 261     Mode cmdline_value = NONE;
 262     if (command_line->HasSwitch(switches::kExtensionContentVerification)) {
 263       std::string switch_value = command_line->GetSwitchValueASCII(
 264           switches::kExtensionContentVerification);
 265       if (switch_value == switches::kExtensionContentVerificationBootstrap)
 266         cmdline_value = ContentVerifierDelegate::BOOTSTRAP;
 267       else if (switch_value == switches::kExtensionContentVerificationEnforce)
 268         cmdline_value = ContentVerifierDelegate::ENFORCE;
 269       else if (switch_value ==
 270               switches::kExtensionContentVerificationEnforceStrict)
 271         cmdline_value = ContentVerifierDelegate::ENFORCE_STRICT;
 272       else
 273         // If no value was provided (or the wrong one), just default to enforce.
 274         cmdline_value = ContentVerifierDelegate::ENFORCE;
 275     }
 276
 277     // We don't want to allow the command-line flags to eg disable enforcement
 278     // if the experiment group says it should be on, or malware may just modify
 279     // the command line flags. So return the more restrictive of the 2 values.
 280     return std::max(experiment_value, cmdline_value);
 281   }
 282
 283  private:
 284   base::WeakPtr<ExtensionService> service_;
 285   ContentVerifierDelegate::Mode default_mode_;
 286
 287   // For reporting metrics in BOOTSTRAP mode, when an extension would be
 288   // disabled if content verification was in ENFORCE mode.
 289   std::set<std::string> would_be_disabled_ids_;
 290
 291   DISALLOW_COPY_AND_ASSIGN(ContentVerifierDelegateImpl);
 292 };
 293
 294 }  // namespace
 295
 296 void ExtensionSystemImpl::Shared::Init(bool extensions_enabled) {
 297   const base::CommandLine* command_line =
 298       base::CommandLine::ForCurrentProcess();
 299
 300   navigation_observer_.reset(new NavigationObserver(profile_));
 301
 302   bool allow_noisy_errors = !command_line->HasSwitch(switches::kNoErrorDialogs);
 303   ExtensionErrorReporter::Init(allow_noisy_errors);
 304
 305   shared_user_script_master_.reset(new SharedUserScriptMaster(profile_));
 306   declarative_user_script_manager_.reset(
 307       new DeclarativeUserScriptManager(profile_));
 308
 309   // ExtensionService depends on RuntimeData.
 310   runtime_data_.reset(new RuntimeData(ExtensionRegistry::Get(profile_)));
 311
 312   bool autoupdate_enabled = !profile_->IsGuestSession();
 313 #if defined(OS_CHROMEOS)
 314   if (!extensions_enabled)
 315     autoupdate_enabled = false;
 316 #endif
 317   extension_service_.reset(new ExtensionService(
 318       profile_, base::CommandLine::ForCurrentProcess(),
 319       profile_->GetPath().AppendASCII(extensions::kInstallDirectoryName),
 320       ExtensionPrefs::Get(profile_), Blacklist::Get(profile_),
 321       autoupdate_enabled, extensions_enabled, &ready_));
 322
 323   // These services must be registered before the ExtensionService tries to
 324   // load any extensions.
 325   {
 326     install_verifier_.reset(
 327         new InstallVerifier(ExtensionPrefs::Get(profile_), profile_));
 328     install_verifier_->Init();
 329     content_verifier_ = new ContentVerifier(
 330         profile_, new ContentVerifierDelegateImpl(extension_service_.get()));
 331     ContentVerifierDelegate::Mode mode =
 332         ContentVerifierDelegateImpl::GetDefaultMode();
 333 #if defined(OS_CHROMEOS)
 334     mode = std::max(mode, ContentVerifierDelegate::BOOTSTRAP);
 335 #endif
 336     if (mode >= ContentVerifierDelegate::BOOTSTRAP)
 337       content_verifier_->Start();
 338     info_map()->SetContentVerifier(content_verifier_.get());
 339
 340     management_policy_.reset(new ManagementPolicy);
 341     RegisterManagementPolicyProviders();
 342   }
 343
 344   bool skip_session_extensions = false;
 345 #if defined(OS_CHROMEOS)
 346   // Skip loading session extensions if we are not in a user session.
 347   skip_session_extensions = !chromeos::LoginState::Get()->IsUserLoggedIn();
 348   if (chrome::IsRunningInForcedAppMode()) {
 349     extension_service_->component_loader()->
 350         AddDefaultComponentExtensionsForKioskMode(skip_session_extensions);
 351   } else {
 352     extension_service_->component_loader()->AddDefaultComponentExtensions(
 353         skip_session_extensions);
 354   }
 355 #else
 356   extension_service_->component_loader()->AddDefaultComponentExtensions(
 357       skip_session_extensions);
 358 #endif
 359   if (command_line->HasSwitch(switches::kLoadComponentExtension)) {
 360     base::CommandLine::StringType path_list =
 361         command_line->GetSwitchValueNative(switches::kLoadComponentExtension);
 362     base::StringTokenizerT<base::CommandLine::StringType,
 363                            base::CommandLine::StringType::const_iterator>
 364         t(path_list, FILE_PATH_LITERAL(","));
 365     while (t.GetNext()) {
 366       // Load the component extension manifest synchronously.
 367       // Blocking the UI thread is acceptable here since
 368       // this flag designated for developers.
 369       base::ThreadRestrictions::ScopedAllowIO allow_io;
 370       extension_service_->component_loader()->AddOrReplace(
 371           base::FilePath(t.token()));
 372     }
 373   }
 374   extension_service_->Init();
 375
 376   // Make the chrome://extension-icon/ resource available.
 377   content::URLDataSource::Add(profile_, new ExtensionIconSource(profile_));
 378
 379   error_console_.reset(new ErrorConsole(profile_));
 380   quota_service_.reset(new QuotaService);
 381
 382   if (extensions_enabled) {
 383     // Load any extensions specified with --load-extension.
 384     // TODO(yoz): Seems like this should move into ExtensionService::Init.
 385     // But maybe it's no longer important.
 386     if (command_line->HasSwitch(switches::kLoadExtension)) {
 387       base::CommandLine::StringType path_list =
 388           command_line->GetSwitchValueNative(switches::kLoadExtension);
 389       base::StringTokenizerT<base::CommandLine::StringType,
 390                              base::CommandLine::StringType::const_iterator>
 391           t(path_list, FILE_PATH_LITERAL(","));
 392       while (t.GetNext()) {
 393         std::string extension_id;
 394         UnpackedInstaller::Create(extension_service_.get())->
 395             LoadFromCommandLine(base::FilePath(t.token()), &extension_id);
 396       }
 397     }
 398   }
 399 }
 400
 401 void ExtensionSystemImpl::Shared::Shutdown() {
 402   if (content_verifier_.get())
 403     content_verifier_->Shutdown();
 404   if (extension_service_)
 405     extension_service_->Shutdown();
 406 }
 407
 408 StateStore* ExtensionSystemImpl::Shared::state_store() {
 409   return state_store_.get();
 410 }
 411
 412 StateStore* ExtensionSystemImpl::Shared::rules_store() {
 413   return rules_store_.get();
 414 }
 415
 416 ExtensionService* ExtensionSystemImpl::Shared::extension_service() {
 417   return extension_service_.get();
 418 }
 419
 420 RuntimeData* ExtensionSystemImpl::Shared::runtime_data() {
 421   return runtime_data_.get();
 422 }
 423
 424 ManagementPolicy* ExtensionSystemImpl::Shared::management_policy() {
 425   return management_policy_.get();
 426 }
 427
 428 SharedUserScriptMaster*
 429 ExtensionSystemImpl::Shared::shared_user_script_master() {
 430   return shared_user_script_master_.get();
 431 }
 432
 433 DeclarativeUserScriptManager*
 434 ExtensionSystemImpl::Shared::declarative_user_script_manager() {
 435   return declarative_user_script_manager_.get();
 436 }
 437
 438 InfoMap* ExtensionSystemImpl::Shared::info_map() {
 439   if (!extension_info_map_.get())
 440     extension_info_map_ = new InfoMap();
 441   return extension_info_map_.get();
 442 }
 443
 444 LazyBackgroundTaskQueue*
 445     ExtensionSystemImpl::Shared::lazy_background_task_queue() {
 446   return lazy_background_task_queue_.get();
 447 }
 448
 449 EventRouter* ExtensionSystemImpl::Shared::event_router() {
 450   return event_router_.get();
 451 }
 452
 453 ErrorConsole* ExtensionSystemImpl::Shared::error_console() {
 454   return error_console_.get();
 455 }
 456
 457 InstallVerifier* ExtensionSystemImpl::Shared::install_verifier() {
 458   return install_verifier_.get();
 459 }
 460
 461 QuotaService* ExtensionSystemImpl::Shared::quota_service() {
 462   return quota_service_.get();
 463 }
 464
 465 ContentVerifier* ExtensionSystemImpl::Shared::content_verifier() {
 466   return content_verifier_.get();
 467 }
 468
 469 //
 470 // ExtensionSystemImpl
 471 //
 472
 473 ExtensionSystemImpl::ExtensionSystemImpl(Profile* profile)
 474     : profile_(profile) {
 475   shared_ = ExtensionSystemSharedFactory::GetForBrowserContext(profile);
 476
 477   if (!profile->IsOffTheRecord()) {
 478     shared_->InitPrefs();
 479   }
 480 }
 481
 482 ExtensionSystemImpl::~ExtensionSystemImpl() {
 483 }
 484
 485 void ExtensionSystemImpl::Shutdown() {
 486 }
 487
 488 void ExtensionSystemImpl::InitForRegularProfile(bool extensions_enabled) {
 489   DCHECK(!profile_->IsOffTheRecord());
 490   if (shared_user_script_master() || extension_service())
 491     return;  // Already initialized.
 492
 493   // The InfoMap needs to be created before the ProcessManager.
 494   shared_->info_map();
 495   shared_->Init(extensions_enabled);
 496 }
 497
 498 ExtensionService* ExtensionSystemImpl::extension_service() {
 499   return shared_->extension_service();
 500 }
 501
 502 RuntimeData* ExtensionSystemImpl::runtime_data() {
 503   return shared_->runtime_data();
 504 }
 505
 506 ManagementPolicy* ExtensionSystemImpl::management_policy() {
 507   return shared_->management_policy();
 508 }
 509
 510 SharedUserScriptMaster* ExtensionSystemImpl::shared_user_script_master() {
 511   return shared_->shared_user_script_master();
 512 }
 513
 514 DeclarativeUserScriptManager*
 515 ExtensionSystemImpl::declarative_user_script_manager() {
 516   return shared_->declarative_user_script_manager();
 517 }
 518
 519 StateStore* ExtensionSystemImpl::state_store() {
 520   return shared_->state_store();
 521 }
 522
 523 StateStore* ExtensionSystemImpl::rules_store() {
 524   return shared_->rules_store();
 525 }
 526
 527 InfoMap* ExtensionSystemImpl::info_map() { return shared_->info_map(); }
 528
 529 LazyBackgroundTaskQueue* ExtensionSystemImpl::lazy_background_task_queue() {
 530   return shared_->lazy_background_task_queue();
 531 }
 532
 533 EventRouter* ExtensionSystemImpl::event_router() {
 534   return shared_->event_router();
 535 }
 536
 537 const OneShotEvent& ExtensionSystemImpl::ready() const {
 538   return shared_->ready();
 539 }
 540
 541 ErrorConsole* ExtensionSystemImpl::error_console() {
 542   return shared_->error_console();
 543 }
 544
 545 InstallVerifier* ExtensionSystemImpl::install_verifier() {
 546   return shared_->install_verifier();
 547 }
 548
 549 QuotaService* ExtensionSystemImpl::quota_service() {
 550   return shared_->quota_service();
 551 }
 552
 553 ContentVerifier* ExtensionSystemImpl::content_verifier() {
 554   return shared_->content_verifier();
 555 }
 556
 557 scoped_ptr<ExtensionSet> ExtensionSystemImpl::GetDependentExtensions(
 558     const Extension* extension) {
 559   return extension_service()->shared_module_service()->GetDependentExtensions(
 560       extension);
 561 }
 562
 563 void ExtensionSystemImpl::RegisterExtensionWithRequestContexts(
 564     const Extension* extension) {
 565   base::Time install_time;
 566   if (extension->location() != Manifest::COMPONENT) {
 567     install_time = ExtensionPrefs::Get(profile_)->
 568         GetInstallTime(extension->id());
 569   }
 570   bool incognito_enabled = util::IsIncognitoEnabled(extension->id(), profile_);
 571
 572   bool notifications_disabled = false;
 573 #if defined(ENABLE_NOTIFICATIONS)
 574   message_center::NotifierId notifier_id(
 575       message_center::NotifierId::APPLICATION,
 576       extension->id());
 577
 578   DesktopNotificationService* notification_service =
 579       DesktopNotificationServiceFactory::GetForProfile(profile_);
 580   notifications_disabled =
 581       !notification_service->IsNotifierEnabled(notifier_id);
 582 #endif
 583
 584   BrowserThread::PostTask(
 585       BrowserThread::IO, FROM_HERE,
 586       base::Bind(&InfoMap::AddExtension, info_map(),
 587                  make_scoped_refptr(extension), install_time,
 588                  incognito_enabled, notifications_disabled));
 589 }
 590
 591 void ExtensionSystemImpl::UnregisterExtensionWithRequestContexts(
 592     const std::string& extension_id,
 593     const UnloadedExtensionInfo::Reason reason) {
 594   BrowserThread::PostTask(
 595       BrowserThread::IO,
 596       FROM_HERE,
 597       base::Bind(&InfoMap::RemoveExtension, info_map(), extension_id, reason));
 598 }
 599
 600 }  // namespace extensions