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

content/renderer/background_sync/background_sync_client_impl.cc

Index: content/renderer/background_sync/background_sync_client_impl.cc
diff --git a/content/renderer/background_sync/background_sync_client_impl.cc b/content/renderer/background_sync/background_sync_client_impl.cc
index 4b1c928c0ee2b6fb23bfd59416a848213e75c43b..bd420c0860c7f5afb2493e27bb96354a03276d42 100644
--- a/content/renderer/background_sync/background_sync_client_impl.cc
+++ b/content/renderer/background_sync/background_sync_client_impl.cc
@@ -70,15 +70,15 @@ void BackgroundSyncClientImpl::SyncDidGetRegistration(
   callback = it->second;
   sync_callbacks_.erase(it);
 
-  if (error != BACKGROUND_SYNC_ERROR_NONE) {
-    callback.Run(SERVICE_WORKER_EVENT_STATUS_ABORTED);
+  if (error != BackgroundSyncError::NONE) {
+    callback.Run(ServiceWorkerEventStatus::ABORTED);
     return;
   }
 
   ServiceWorkerContextClient* client =
       ServiceWorkerContextClient::ThreadSpecificInstance();
   if (!client) {
-    callback.Run(SERVICE_WORKER_EVENT_STATUS_ABORTED);
+    callback.Run(ServiceWorkerEventStatus::ABORTED);
     return;
   }