Implement the PageNotificationDelegate for the new Web Notification path.

content/browser/notification_message_filter.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_BROWSER_NOTIFICATION_MESSAGE_FILTER_H_
-#define CONTENT_BROWSER_NOTIFICATION_MESSAGE_FILTER_H_
-
-#include "content/public/browser/browser_message_filter.h"
-#include "third_party/WebKit/public/platform/WebNotificationPermission.h"
-
-class GURL;
-
-namespace content {
-
-class ResourceContext;
-struct ShowDesktopNotificationHostMsgParams;
-
-class NotificationMessageFilter : public BrowserMessageFilter {
- public:
-  NotificationMessageFilter(
-      int process_id,
-      ResourceContext* resource_context);
-
-  // BrowserMessageFilter implementation. Called on the UI thread.
-  bool OnMessageReceived(const IPC::Message& message) override;
-  void OverrideThreadForMessage(
-      const IPC::Message& message, content::BrowserThread::ID* thread) override;
-
- protected:
-  ~NotificationMessageFilter() override;
-
- private:
-  void OnCheckNotificationPermission(
-    const GURL& origin, blink::WebNotificationPermission* permission);
-  void OnShowPlatformNotification(
-    int notification_id, const ShowDesktopNotificationHostMsgParams& params);
-  void OnClosePlatformNotification(int notification_id);
-
-  int process_id_;
-  ResourceContext* resource_context_;
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_NOTIFICATION_MESSAGE_FILTER_H_