Fixed a leaked partial wakelock in AbstractThreadedSyncAdapter.

This fix ensures that onFinished() is always called in a syncClient
even if the application lacks the READ_SYNC_SETTINGS permission.

Change-Id: I944717e71ceae06a665f8a3b1199b41d73e12da4
fix typo: Remove dulplicated comment line

Change-Id: I6b95998b4af5b27c7e1f9040aa5e7b7deb5d8609