GitLab

- Call PSS::ShowLoginDialog directly from app notification code so that the dialog comes up even if the user is logged in.
- Small fix to PSS to avoid infinite spinner in cases where the sync backend does not really change anything (ahd hence does not call back PSS).
Review URL: http://codereview.chromium.org/8783001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@112840 0039d316-1c4b-4281-b951-d872f2087c98