Revert 150990 - [Sync] Avoid unregistering object IDs on shutdown

chrome/browser/sync/glue/chrome_sync_notification_bridge.h

Index: chrome/browser/sync/glue/chrome_sync_notification_bridge.h
===================================================================
--- chrome/browser/sync/glue/chrome_sync_notification_bridge.h	(revision 150991)
+++ chrome/browser/sync/glue/chrome_sync_notification_bridge.h	(working copy)
@@ -36,18 +36,11 @@
       const scoped_refptr<base::SequencedTaskRunner>& sync_task_runner);
   virtual ~ChromeSyncNotificationBridge();
 
-  // Must be called on the UI thread while the sync task runner is still
-  // around.  No other member functions on the sync thread may be called after
-  // this is called.
-  void StopForShutdown();
-
   // Must be called on the sync task runner.
   void UpdateEnabledTypes(syncer::ModelTypeSet enabled_types);
   // Marked virtual for tests.
-  virtual void RegisterHandler(syncer::SyncNotifierObserver* handler);
   virtual void UpdateRegisteredIds(syncer::SyncNotifierObserver* handler,
                                    const syncer::ObjectIdSet& ids);
-  virtual void UnregisterHandler(syncer::SyncNotifierObserver* handler);
 
   // NotificationObserver implementation. Called on UI thread.
   virtual void Observe(int type,