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

examples/browser/browser.cc

 // Copyright 2014 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 "base/macros.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "examples/browser/browser_host.mojom.h"
 #include "examples/window_manager/window_manager.mojom.h"
 #include "mojo/application/application_runner_chromium.h"
@@ skipping 87 matching lines @@
   void OnViewDestroyed(View* view) override {
     DCHECK_EQ(root_, view);
     view->RemoveObserver(this);
     root_ = NULL;
   }
 
   // examples::BrowserHost:
   void NavigateTo(const mojo::String& url) override {
     URLRequestPtr request(URLRequest::New());
     request->url = url;
-    navigator_host_->RequestNavigate(TARGET_NEW_NODE, request.Pass());
+    navigator_host_->RequestNavigate(Target::NEW_NODE, request.Pass());
   }
 
   // mojo::InterfaceFactory<examples::BrowserHost> implementation.
   void Create(mojo::ApplicationConnection* connection,
               mojo::InterfaceRequest<examples::BrowserHost> request) override {
     binding_.Bind(request.Pass());
   }
 
   Shell* shell_;
 
@@ skipping 10 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(Browser);
 };
 
 }  // namespace examples
 }  // namespace mojo
 
 MojoResult MojoMain(MojoHandle application_request) {
   mojo::ApplicationRunnerChromium runner(new mojo::examples::Browser);
   return runner.Run(application_request);
 }