[Sync] Avoid unregistering object IDs on shutdown

sync/notifier/invalidation_notifier.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // An implementation of SyncNotifier that wraps an invalidation
 // client.  Handles the details of connecting to XMPP and hooking it
 // up to the invalidation client.
 //
 // You probably don't want to use this directly; use
 // NonBlockingInvalidationNotifier.
@@ skipping 31 matching lines @@
       scoped_ptr<notifier::PushClient> push_client,
       const InvalidationVersionMap& initial_max_invalidation_versions,
       const std::string& initial_invalidation_state,
       const WeakHandle<InvalidationStateTracker>&
           invalidation_state_tracker,
       const std::string& client_info);
 
   virtual ~InvalidationNotifier();
 
   // SyncNotifier implementation.
-  virtual void UpdateRegisteredIds(SyncNotifierObserver* handler,
+  virtual void SetHandler(const std::string& handler_name,
+                          SyncNotifierObserver* handler) OVERRIDE;
+  virtual void UpdateRegisteredIds(const std::string& handler_name,
                                    const ObjectIdSet& ids) OVERRIDE;
   virtual void SetUniqueId(const std::string& unique_id) OVERRIDE;
   virtual void SetStateDeprecated(const std::string& state) OVERRIDE;
   virtual void UpdateCredentials(
       const std::string& email, const std::string& token) OVERRIDE;
   virtual void SendNotification(ModelTypeSet changed_types) OVERRIDE;
 
   // ChromeInvalidationClient::Listener implementation.
   virtual void OnInvalidate(const ObjectIdPayloadMap& id_payloads) OVERRIDE;
   virtual void OnNotificationsEnabled() OVERRIDE;
@@ skipping 34 matching lines @@
 
   // The invalidation client.
   ChromeInvalidationClient invalidation_client_;
 
   DISALLOW_COPY_AND_ASSIGN(InvalidationNotifier);
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_NOTIFIER_INVALIDATION_NOTIFIER_H_