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

sync/tools/sync_client.cc

Index: sync/tools/sync_client.cc
diff --git a/sync/tools/sync_client.cc b/sync/tools/sync_client.cc
index 8422d2eb7ce4e62c06281d06b8a6e23585f1b572..c8aa9eabacf557dfe147ae7b036bd790755c32d1 100644
--- a/sync/tools/sync_client.cc
+++ b/sync/tools/sync_client.cc
@@ -445,8 +445,8 @@ int SyncClientMain(int argc, char* argv[]) {
   invalidator->UpdateCredentials(credentials.email, credentials.sync_token);
   scoped_ptr<InvalidatorShim> shim(new InvalidatorShim(sync_manager.get()));
   invalidator->RegisterHandler(shim.get());
-  invalidator->UpdateRegisteredIds(
-      shim.get(), ModelTypeSetToObjectIdSet(model_types));
+  CHECK(invalidator->UpdateRegisteredIds(
+      shim.get(), ModelTypeSetToObjectIdSet(model_types)));
   sync_manager->StartSyncingNormally(routing_info, base::Time());
 
   sync_loop.Run();