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

components/invalidation/p2p_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 "components/invalidation/p2p_invalidation_service.h"
 
 #include "base/command_line.h"
 #include "components/invalidation/invalidation_service_util.h"
 #include "components/invalidation/p2p_invalidator.h"
 #include "google_apis/gaia/identity_provider.h"
@@ skipping 28 matching lines @@
 void P2PInvalidationService::UpdateCredentials(const std::string& username,
                                                const std::string& password) {
   invalidator_->UpdateCredentials(username, password);
 }
 
 void P2PInvalidationService::RegisterInvalidationHandler(
     syncer::InvalidationHandler* handler) {
   invalidator_->RegisterHandler(handler);
 }
 
-void P2PInvalidationService::UpdateRegisteredInvalidationIds(
+bool P2PInvalidationService::UpdateRegisteredInvalidationIds(
     syncer::InvalidationHandler* handler,
     const syncer::ObjectIdSet& ids) {
-  invalidator_->UpdateRegisteredIds(handler, ids);
+  return invalidator_->UpdateRegisteredIds(handler, ids);
 }
 
 void P2PInvalidationService::UnregisterInvalidationHandler(
     syncer::InvalidationHandler* handler) {
   invalidator_->UnregisterHandler(handler);
 }
 
 void P2PInvalidationService::SendInvalidation(
     const syncer::ObjectIdSet& ids) {
   invalidator_->SendInvalidation(ids);
@@ skipping 15 matching lines @@
     base::Callback<void(const base::DictionaryValue&)> caller) const {
   base::DictionaryValue value;
   caller.Run(value);
 }
 
 IdentityProvider* P2PInvalidationService::GetIdentityProvider() {
   return identity_provider_.get();
 }
 
 }  // namespace invalidation