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The SyncManager will stop the scheduler as part of StopSyncingForShutdown, which
happens well before things like the invalidator are torn down / told to stop
interacting with the scheduler.  As such, we can wind up scheduling nudges on a lame
duck scheduler.  Some of the stacks associated with 165561 clearly show browser
shutdown happening on the UI thread and OnIncomingInvalidation happening on the
sync thread, which will crash on a second invocation as pending_nudge will be
set to a job that is dropped by ScheduleSyncSessionJob.

BUG=165561


Review URL: https://chromiumcodereview.appspot.com/11827013

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@175945 0039d316-1c4b-4281-b951-d872f2087c98