Make //content responsible for generating notification Ids

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 <set>
 #include <string>
 
@@ skipping 23 matching lines @@
                        const Notification& notification) = 0;
 
   // Closes the notification identified by |notification_id|.
   virtual void Close(NotificationCommon::Type notification_type,
                      const std::string& notification_id) = 0;
 
   // Returns whether the implementation can retrieve a list of currently visible
   // notifications and stores them in |*notification_ids| when possible.
   virtual bool GetDisplayed(std::set<std::string>* notifications) const = 0;
 
-  // Temporary method while we finish the refactor. Returns whether there is
-  // a native notification center backing up notifications.
-  virtual bool SupportsNotificationCenter() const = 0;
-
  private:
   DISALLOW_COPY_AND_ASSIGN(NotificationDisplayService);
 };
 
 #endif  // CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_DISPLAY_SERVICE_H_