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

components/invalidation/p2p_invalidation_service.cc

Index: components/invalidation/p2p_invalidation_service.cc
diff --git a/components/invalidation/p2p_invalidation_service.cc b/components/invalidation/p2p_invalidation_service.cc
index 9829415494ba0533337d007b4b5fa255b71d2080..a528e9f07e38670b0a177b7c43a2fb788a8e9bee 100644
--- a/components/invalidation/p2p_invalidation_service.cc
+++ b/components/invalidation/p2p_invalidation_service.cc
@@ -46,10 +46,10 @@ void P2PInvalidationService::RegisterInvalidationHandler(
   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(