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Fix the app notify channel setup for the case where the user may have explicitly revoked permission and hence the OAuth2
access token generation may fail. In that case, prompt the user.
add unit tests and modify existing tests.

TBR=asargent
Review URL: http://codereview.chromium.org/8822006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@113164 0039d316-1c4b-4281-b951-d872f2087c98