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We need to do so because we now have asserts which make sure ref/deref of RefCounted happen on the right thread.

TEST=None
BUG=None


Review URL: http://codereview.chromium.org/7629006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@96595 0039d316-1c4b-4281-b951-d872f2087c98