For c++, Generate enum classes instead of enum from mojom.

examples/embedded_app/embedded_app.cc

Index: examples/embedded_app/embedded_app.cc
diff --git a/examples/embedded_app/embedded_app.cc b/examples/embedded_app/embedded_app.cc
index 7d0dcdb47b9bfcdcc29941dc1a4211a2427d3399..2554a0e912f02588d00cd6d9d22c07260c819f22 100644
--- a/examples/embedded_app/embedded_app.cc
+++ b/examples/embedded_app/embedded_app.cc
@@ -86,15 +86,15 @@ class EmbeddedApp
     windows_.erase(view->id());
   }
   void OnViewInputEvent(View* view, const EventPtr& event) override {
-    if (event->action == EVENT_TYPE_POINTER_UP &&
+    if (event->action == EventType::POINTER_UP &&
         (static_cast<uint32_t>(event->flags) &
-         static_cast<uint32_t>(EVENT_FLAGS_LEFT_MOUSE_BUTTON))) {
+         static_cast<uint32_t>(EventFlags::LEFT_MOUSE_BUTTON))) {
       URLRequestPtr request(URLRequest::New());
       request->url = "http://www.aaronboodman.com/z_dropbox/test.html";
       NavigatorHostPtr navigator_host;
       ConnectToService(windows_[view->id()]->embedder_service_provider.get(),
                        &navigator_host);
-      navigator_host->RequestNavigate(TARGET_SOURCE_NODE, request.Pass());
+      navigator_host->RequestNavigate(Target::SOURCE_NODE, request.Pass());
     }
   }