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

sync/tools/sync_listen_notifications.cc

 // Copyright (c) 2012 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 <cstddef>
 #include <cstdio>
 #include <string>
 
 #include "base/at_exit.h"
 #include "base/command_line.h"
@@ skipping 183 matching lines @@
           &null_invalidation_state_tracker,
           kClientInfo,
           notifier_options.request_context_getter));
 
   NotificationPrinter notification_printer;
 
   invalidator->UpdateCredentials(email, token);
 
   // Listen for notifications for all known types.
   invalidator->RegisterHandler(&notification_printer);
-  invalidator->UpdateRegisteredIds(
-      &notification_printer, ModelTypeSetToObjectIdSet(ModelTypeSet::All()));
+  CHECK(invalidator->UpdateRegisteredIds(
+      &notification_printer, ModelTypeSetToObjectIdSet(ModelTypeSet::All())));
 
   ui_loop.Run();
 
   invalidator->UnregisterHandler(&notification_printer);
   io_thread.Stop();
   return 0;
 }
 
 }  // namespace
 }  // namespace syncer
 
 int main(int argc, char* argv[]) {
   return syncer::SyncListenNotificationsMain(argc, argv);
 }