[Sync] Avoid unregistering object IDs on shutdown

sync/internal_api/sync_manager_impl.h

Index: sync/internal_api/sync_manager_impl.h
diff --git a/sync/internal_api/sync_manager_impl.h b/sync/internal_api/sync_manager_impl.h
index 01f37fcba1c15fc3a51c697cf4fa980b798f00c1..6d9ba88877c6955bc4c78ac1378fba75e57ba26b 100644
--- a/sync/internal_api/sync_manager_impl.h
+++ b/sync/internal_api/sync_manager_impl.h
@@ -86,8 +86,11 @@ class SyncManagerImpl : public SyncManager,
   virtual void UpdateCredentials(const SyncCredentials& credentials) OVERRIDE;
   virtual void UpdateEnabledTypes(
       const ModelTypeSet& enabled_types) OVERRIDE;
+  virtual void SetInvalidationHandler(
+      const std::string& handler_name,
+      SyncNotifierObserver* handler) OVERRIDE;
   virtual void UpdateRegisteredInvalidationIds(
-      SyncNotifierObserver* handler,
+      const std::string& handler_name,
       const ObjectIdSet& ids) OVERRIDE;
   virtual void StartSyncingNormally(
       const ModelSafeRoutingInfo& routing_info) OVERRIDE;