Call NotifyObservers() after setting sync setup completed.
Call NotifyObservers() after setting sync setup completed.

The UI behavior changes once HasSyncSetupCompleted() returns true, so we need to notify observers when we set this in OnBackendInitialized().

BUG=chromium-os:23151
TEST=See issue. Also make sure error clears correctly and is set correctly for other sync errors.

Review URL: http://codereview.chromium.org/8876001

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@113643 0039d316-1c4b-4281-b951-d872f2087c98

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