Change mojo enums to be scoped enums in the generated C++ bindings.

content/renderer/service_worker/service_worker_context_client.cc

Index: content/renderer/service_worker/service_worker_context_client.cc
diff --git a/content/renderer/service_worker/service_worker_context_client.cc b/content/renderer/service_worker/service_worker_context_client.cc
index ecf84b8497268228ed2081936fc0a32aacfd959e..348e8093ab2dc5bbbe91d820e0b3897377d564c9 100644
--- a/content/renderer/service_worker/service_worker_context_client.cc
+++ b/content/renderer/service_worker/service_worker_context_client.cc
@@ -539,9 +539,9 @@ void ServiceWorkerContextClient::didHandleSyncEvent(
   if (!callback)
     return;
   if (result == blink::WebServiceWorkerEventResultCompleted) {
-    callback->Run(SERVICE_WORKER_EVENT_STATUS_COMPLETED);
+    callback->Run(ServiceWorkerEventStatus::COMPLETED);
   } else {
-    callback->Run(SERVICE_WORKER_EVENT_STATUS_REJECTED);
+    callback->Run(ServiceWorkerEventStatus::REJECTED);
   }
   context_->sync_event_callbacks.Remove(request_id);
 }