Remove a renderer -> browser roundtrip for resolving the showNotification promise.

content/child/notifications/notification_manager.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_CHILD_NOTIFICATIONS_NOTIFICATION_MANAGER_H_
 #define CONTENT_CHILD_NOTIFICATIONS_NOTIFICATION_MANAGER_H_
 
 #include <map>
 #include <set>
 
@@ skipping 51 matching lines @@
   // Called by the NotificationDispatcher.
   bool OnMessageReceived(const IPC::Message& message);
 
  private:
   NotificationManager(
       ThreadSafeSender* thread_safe_sender,
       base::SingleThreadTaskRunner* main_thread_task_runner,
       NotificationDispatcher* notification_dispatcher);
 
   // IPC message handlers.
-  void OnDidShowPersistent(int request_id);
   void OnDidShow(int notification_id);
   void OnDidClose(int notification_id);
   void OnDidClick(int notification_id);
 
   // Asynchronously starts loading |image_url| on the main thread and returns a
   // reference to the notification image loaded responsible for this. |callback|
   // will be invoked on the calling thread when the load is complete.
   scoped_refptr<NotificationImageLoader> CreateImageLoader(
       const blink::WebURL& image_url,
       const NotificationImageLoadedCallback& callback) const;
@@ skipping 41 matching lines @@
   std::map<int, blink::WebNotificationDelegate*> active_notifications_;
 
   base::WeakPtrFactory<NotificationManager> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NotificationManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_NOTIFICATIONS_NOTIFICATION_MANAGER_H_