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

chrome/browser/invalidation/fake_invalidation_service.cc

 // Copyright 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.
 
 #include "chrome/browser/invalidation/fake_invalidation_service.h"
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "components/invalidation/invalidation_service_util.h"
 #include "components/invalidation/object_id_invalidation_map.h"
 
 namespace invalidation {
 
 FakeInvalidationService::FakeInvalidationService()
     : client_id_(GenerateInvalidatorClientId()),
       identity_provider_(&token_service_) {
   invalidator_registrar_.UpdateInvalidatorState(syncer::INVALIDATIONS_ENABLED);
   token_service_.set_auto_post_fetch_response_on_message_loop(true);
 }
 
 FakeInvalidationService::~FakeInvalidationService() {
 }
 
 void FakeInvalidationService::RegisterInvalidationHandler(
       syncer::InvalidationHandler* handler) {
   invalidator_registrar_.RegisterHandler(handler);
 }
 
-void FakeInvalidationService::UpdateRegisteredInvalidationIds(
-      syncer::InvalidationHandler* handler,
-      const syncer::ObjectIdSet& ids) {
-  invalidator_registrar_.UpdateRegisteredIds(handler, ids);
+bool FakeInvalidationService::UpdateRegisteredInvalidationIds(
+    syncer::InvalidationHandler* handler,
+    const syncer::ObjectIdSet& ids) {
+  return invalidator_registrar_.UpdateRegisteredIds(handler, ids);
 }
 
 void FakeInvalidationService::UnregisterInvalidationHandler(
       syncer::InvalidationHandler* handler) {
   invalidator_registrar_.UnregisterHandler(handler);
 }
 
 syncer::InvalidatorState FakeInvalidationService::GetInvalidatorState() const {
   return invalidator_registrar_.GetInvalidatorState();
 }
@@ skipping 41 matching lines @@
   syncer::ObjectIdInvalidationMap invalidation_map;
   invalidation_map.Insert(invalidation_copy);
   invalidator_registrar_.DispatchInvalidationsToHandlers(invalidation_map);
 }
 
 syncer::MockAckHandler* FakeInvalidationService::GetMockAckHandler() {
   return &mock_ack_handler_;
 }
 
 }  // namespace invalidation