Push API: use an enum to indicate status.

content/renderer/push_messaging_dispatcher.h

 // 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.
 
 #ifndef CONTENT_RENDERER_PUSH_MESSAGING_DISPATCHER_H_
 #define CONTENT_RENDERER_PUSH_MESSAGING_DISPATCHER_H_
 
 #include <string>
 
 #include "base/id_map.h"
+#include "content/public/common/push_messaging_status.h"
 #include "content/public/renderer/render_frame_observer.h"
 #include "third_party/WebKit/public/platform/WebPushClient.h"
 
 class GURL;
 
 namespace IPC {
 class Message;
 }  // namespace IPC
 
 namespace blink {
@@ skipping 20 matching lines @@
       blink::WebPushRegistrationCallbacks* callbacks);
   virtual void registerPushMessaging(
       const blink::WebString& sender_id,
       blink::WebPushRegistrationCallbacks* callbacks,
       blink::WebServiceWorkerProvider* service_worker_provider);
 
   void OnRegisterSuccess(int32 callbacks_id,
                          const GURL& endpoint,
                          const std::string& registration_id);
 
-  void OnRegisterError(int32 callbacks_id);
+  void OnRegisterError(int32 callbacks_id, PushMessagingStatus status);
 
   IDMap<blink::WebPushRegistrationCallbacks, IDMapOwnPointer>
       registration_callbacks_;
 
   DISALLOW_COPY_AND_ASSIGN(PushMessagingDispatcher);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_PUSH_MESSAGING_DISPATCHER_H_