Use Mojo Permission Service when requesting Notifications permission.

content/child/notifications/notification_dispatcher.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 "content/child/notifications/notification_dispatcher.h"
 
 #include "base/message_loop/message_loop_proxy.h"
 #include "content/child/notifications/notification_manager.h"
 #include "content/child/thread_safe_sender.h"
 #include "content/child/worker_thread_task_runner.h"
@@ skipping 45 matching lines @@
     return false;
 
   NotificationManager::ThreadSpecificInstance(
       thread_safe_sender_.get(),
       main_thread_loop_proxy_.get(),
       this)->OnMessageReceived(msg);
   return true;
 }
 
 bool NotificationDispatcher::ShouldHandleMessage(const IPC::Message& msg) {
-  // The thread-safe message filter is responsible for handling all the messages
-  // except for the routed permission-request-completed message, which will be
-  // picked up by the RenderFrameImpl instead.
-  return IPC_MESSAGE_CLASS(msg) == PlatformNotificationMsgStart &&
-         msg.type() != PlatformNotificationMsg_PermissionRequestComplete::ID;
+  return IPC_MESSAGE_CLASS(msg) == PlatformNotificationMsgStart;
 }
 
 }  // namespace content