Deprecate per notification type delegates.

content/browser/notifications/page_notification_delegate.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_NOTIFICATIONS_PAGE_NOTIFICATION_DELEGATE_H_
-#define CONTENT_BROWSER_NOTIFICATIONS_PAGE_NOTIFICATION_DELEGATE_H_
-
-#include <string>
-
-#include "content/public/browser/desktop_notification_delegate.h"
-
-namespace content {
-
-// A delegate used by the notification service to report the results of platform
-// notification interactions to Web Notifications whose lifetime is tied to
-// that of the page displaying them.
-class PageNotificationDelegate : public DesktopNotificationDelegate {
- public:
-  PageNotificationDelegate(int render_process_id,
-                           int non_persistent_notification_id,
-                           const std::string& notification_id);
-  ~PageNotificationDelegate() override;
-
-  // DesktopNotificationDelegate implementation.
-  void NotificationDisplayed() override;
-  void NotificationClosed() override;
-  void NotificationClick() override;
-
- private:
-  int render_process_id_;
-  int non_persistent_notification_id_;
-  std::string notification_id_;
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_NOTIFICATIONS_PAGE_NOTIFICATION_DELEGATE_H_