[Sync] InvalidationService shouldn't CHECK when registering ObjectId for more than one handler

components/invalidation/invalidation_service_android.h

 // Copyright (c) 2013 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 COMPONENTS_INVALIDATION_INVALIDATION_SERVICE_ANDROID_H_
 #define COMPONENTS_INVALIDATION_INVALIDATION_SERVICE_ANDROID_H_
 
 #include <jni.h>
 #include <map>
 
@@ skipping 21 matching lines @@
   InvalidationServiceAndroid(jobject context);
   ~InvalidationServiceAndroid() override;
 
   // InvalidationService implementation.
   //
   // Note that this implementation does not properly support Ack-tracking,
   // fetching the invalidator state, or querying the client's ID.  Support for
   // exposing the client ID should be available soon; see crbug.com/172391.
   void RegisterInvalidationHandler(
       syncer::InvalidationHandler* handler) override;
-  void UpdateRegisteredInvalidationIds(syncer::InvalidationHandler* handler,
+  bool UpdateRegisteredInvalidationIds(syncer::InvalidationHandler* handler,
                                        const syncer::ObjectIdSet& ids) override;
   void UnregisterInvalidationHandler(
       syncer::InvalidationHandler* handler) override;
   syncer::InvalidatorState GetInvalidatorState() const override;
   std::string GetInvalidatorClientId() const override;
   InvalidationLogger* GetInvalidationLogger() override;
   void RequestDetailedStatus(
       base::Callback<void(const base::DictionaryValue&)> caller) const override;
   IdentityProvider* GetIdentityProvider() override;
 
@@ skipping 38 matching lines @@
 
   void DispatchInvalidations(
       syncer::ObjectIdInvalidationMap& object_invalidation_map);
 
   DISALLOW_COPY_AND_ASSIGN(InvalidationServiceAndroid);
 };
 
 }  // namespace invalidation
 
 #endif  // COMPONENTS_INVALIDATION_INVALIDATION_SERVICE_ANDROID_H_