[Sync] Avoid unregistering object IDs on shutdown

sync/internal_api/sync_manager_impl.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.
 
 #ifndef SYNC_INTERNAL_API_SYNC_MANAGER_H_
 #define SYNC_INTERNAL_API_SYNC_MANAGER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 69 matching lines @@
       ReportUnrecoverableErrorFunction
           report_unrecoverable_error_function) OVERRIDE;
   virtual void ThrowUnrecoverableError() OVERRIDE;
   virtual ModelTypeSet InitialSyncEndedTypes() OVERRIDE;
   virtual ModelTypeSet GetTypesWithEmptyProgressMarkerToken(
       ModelTypeSet types) OVERRIDE;
   virtual bool PurgePartiallySyncedTypes() OVERRIDE;
   virtual void UpdateCredentials(const SyncCredentials& credentials) OVERRIDE;
   virtual void UpdateEnabledTypes(
       const ModelTypeSet& enabled_types) OVERRIDE;
+  virtual void RegisterInvalidationHandler(
+      SyncNotifierObserver* handler) OVERRIDE;
   virtual void UpdateRegisteredInvalidationIds(
       SyncNotifierObserver* handler,
       const ObjectIdSet& ids) OVERRIDE;
+  virtual void UnregisterInvalidationHandler(
+      SyncNotifierObserver* handler) OVERRIDE;
   virtual void StartSyncingNormally(
       const ModelSafeRoutingInfo& routing_info) OVERRIDE;
   virtual void SetEncryptionPassphrase(const std::string& passphrase,
                                        bool is_explicit) OVERRIDE;
   virtual void SetDecryptionPassphrase(const std::string& passphrase) OVERRIDE;
   virtual void ConfigureSyncer(
       ConfigureReason reason,
       const ModelTypeSet& types_to_config,
       const ModelSafeRoutingInfo& new_routing_info,
       const base::Closure& ready_task,
@@ skipping 312 matching lines @@
   // conflict resolver) updated the nigori's encryption keys in this chrome
   // instantiation.
   int nigori_overwrite_count_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncManagerImpl);
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_INTERNAL_API_SYNC_MANAGER_H_