Remove a preference read from onCreate in ChromeBrowserProvider.
The call to read the preference used to happen on every application startup
even if the provider is not going to be used. Since we only kick off the
shared preferences load on the line before, the read causes the UI thread to
pause until the preferences are done loading on a separate thread.
Moving access to this variable into a getter function to have it lazily
initialize.
BUG=234927
Review URL: https://chromiumcodereview.appspot.com/
14450005
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@196896 0039d316-1c4b-4281-b951-d872f2087c98