Revert 233920 "Update V8 to version 3.23.1."

Revert 233920 "Update V8 to version 3.23.1."

Speculative revert of v8 due to:

browser_tests
netInternalsEventsViewFilter

#
# Fatal error in ../../v8/src/objects-inl.h, line 343
# CHECK(IsFlat()) failed
#

==== C stack trace ===============================

 1: ??
 2: ??
 3: ??
 4: ??
Xlib:  extension "RANDR" missing on display ":9".
BrowserTestBase signal handler received SIGTERM. Backtrace:
 [0x7fe63ffcbb74] base::debug::StackTrace::StackTrace()
 [0x000002eb6919] content::(anonymous namespace)::DumpStackTraceSignalHandler()
 [0x7fe6304f74a0] <unknown>
 [0x7fe6305a9a43] __poll
 [0x7fe631d4eff6] <unknown>
 [0x7fe631d4f124] g_main_context_iteration
 [0x7fe63ff9e346] base::MessagePumpGlib::RunWithDispatcher()
 [0x7fe63ff9e7c2] base::MessagePumpGlib::Run()
 [0x7fe640029ba7] base::MessageLoop::RunInternal()
 [0x7fe640029ada] base::MessageLoop::RunHandler()
 [0x7fe6400697a8] base::RunLoop::Run()
 [0x000002f022eb] content::RunThisRunLoop()
 [0x000002f02278] content::RunMessageLoop()
 [0x000000f68056] WebUITestHandler::WaitForResult()
 [0x000000f677cf] WebUITestHandler::RunJavaScriptTestWithResult()
 [0x00000102a920] WebUIBrowserTest::RunJavascriptUsingHandler()
 [0x000001028bf5] WebUIBrowserTest::RunJavascriptAsyncTest()
 [0x00000102881a] WebUIBrowserTest::RunJavascriptTestF()
 [0x000000838817] NetInternalsTest_netInternalsEventsViewFilter_Test::RunTestOnMainThread()

> Update V8 to version 3.23.1.
>
> TBR=jkummerow@chromium.org
> BUG=
>
> Review URL: https://codereview.chromium.org/66283003

TBR=machenbach@chromium.org

Review URL: https://codereview.chromium.org/66923003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@233940 0039d316-1c4b-4281-b951-d872f2087c98