Move Web Notifications to use Mojo

content/child/service_worker/web_service_worker_registration_impl.cc

Index: content/child/service_worker/web_service_worker_registration_impl.cc
diff --git a/content/child/service_worker/web_service_worker_registration_impl.cc b/content/child/service_worker/web_service_worker_registration_impl.cc
index 8b40190a8ad26e3e4cc4090854bc5f1001097210..4f52553e0221b66eeb5c6895c01ad727f939bb34 100644
--- a/content/child/service_worker/web_service_worker_registration_impl.cc
+++ b/content/child/service_worker/web_service_worker_registration_impl.cc
@@ -145,6 +145,10 @@ void WebServiceWorkerRegistrationImpl::unregister(
                                       registration_id(), callbacks);
 }
 
+int64_t WebServiceWorkerRegistrationImpl::registrationId() {
+  return registration_id();
+}
+
 int64_t WebServiceWorkerRegistrationImpl::registration_id() const {
   return handle_ref_->registration_id();
 }