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for new users only when the oauth login token is successfully generated.
Make sure for existing logged in users, it continues to setup sync
properly on startup.
Review URL: http://codereview.chromium.org/8760019

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@112714 0039d316-1c4b-4281-b951-d872f2087c98