GitLab

It's replaced by a version which takes an isolate. The default ctor will be
removed soon.

BUG=NONE

Review URL: https://chromiumcodereview.appspot.com/23679004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@221689 0039d316-1c4b-4281-b951-d872f2087c98