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

chrome/browser/sync/test/integration/fake_server_invalidation_service.cc

 // Copyright 2014 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/sync/test/integration/fake_server_invalidation_service.h"
 
 #include <string>
 
 #include "base/macros.h"
 #include "chrome/browser/sync/glue/invalidation_helper.h"
@@ skipping 12 matching lines @@
 }
 
 FakeServerInvalidationService::~FakeServerInvalidationService() {
 }
 
 void FakeServerInvalidationService::RegisterInvalidationHandler(
       syncer::InvalidationHandler* handler) {
   invalidator_registrar_.RegisterHandler(handler);
 }
 
-void FakeServerInvalidationService::UpdateRegisteredInvalidationIds(
+bool FakeServerInvalidationService::UpdateRegisteredInvalidationIds(
       syncer::InvalidationHandler* handler,
       const syncer::ObjectIdSet& ids) {
-  invalidator_registrar_.UpdateRegisteredIds(handler, ids);
+  return invalidator_registrar_.UpdateRegisteredIds(handler, ids);
 }
 
 void FakeServerInvalidationService::UnregisterInvalidationHandler(
       syncer::InvalidationHandler* handler) {
   invalidator_registrar_.UnregisterHandler(handler);
 }
 
 syncer::InvalidatorState FakeServerInvalidationService::GetInvalidatorState()
     const {
   return invalidator_registrar_.GetInvalidatorState();
@@ skipping 38 matching lines @@
     // invalidating all items of a given type.
 
     if (self_notify_ || client_id_ != committer_id) {
       invalidation_map.Insert(syncer::Invalidation::InitUnknownVersion(*it));
     }
   }
   invalidator_registrar_.DispatchInvalidationsToHandlers(invalidation_map);
 }
 
 }  // namespace fake_server