Revert of Deprecate native and extension notification delegates.

chrome/browser/notifications/notification_display_service.h

 // Copyright 2016 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 CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_DISPLAY_SERVICE_H_
 #define CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_DISPLAY_SERVICE_H_
 
 #include <map>
 #include <memory>
 #include <set>
@@ skipping 43 matching lines @@
   // The events are received and dispatched to the right consumer depending on
   // the type of notification. Consumers include, service workers, pages,
   // extensions...
   void ProcessNotificationOperation(NotificationCommon::Operation operation,
                                     NotificationCommon::Type notification_type,
                                     const std::string& origin,
                                     const std::string& notification_id,
                                     int action_index,
                                     const base::NullableString16& reply);
 
-  // Return whether a notification of |notification_type| should be displayed
-  // for |origin| when the browser is in full screen mode.
-  bool ShouldDisplayOverFullscreen(const GURL& origin,
-                                   NotificationCommon::Type notification_type);
-
  protected:
   NotificationHandler* GetNotificationHandler(
       NotificationCommon::Type notification_type);
 
  private:
   // Registers an implementation object to handle notification operations
   // for |notification_type|.
   void AddNotificationHandler(NotificationCommon::Type notification_type,
                               std::unique_ptr<NotificationHandler> handler);
 
   std::map<NotificationCommon::Type, std::unique_ptr<NotificationHandler>>
       notification_handlers_;
   Profile* profile_;
 
   DISALLOW_COPY_AND_ASSIGN(NotificationDisplayService);
 };
 
 #endif  // CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_DISPLAY_SERVICE_H_