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A number of users have been reporting problems with the identity API. Gaia investigations reveal that these users have overflowed a limit on the number of login tokens they can have for Chrome. Revoking tokens we don't need any longer should mitigate the problem. 

This is identical to https://codereview.chromium.org/13249007/ but with a corrected base url.

BUG=224462

Review URL: https://chromiumcodereview.appspot.com/13599003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@192491 0039d316-1c4b-4281-b951-d872f2087c98