Revert of Deprecate native and extension notification delegates.

chrome/browser/notifications/notification_display_service.h

Index: chrome/browser/notifications/notification_display_service.h
diff --git a/chrome/browser/notifications/notification_display_service.h b/chrome/browser/notifications/notification_display_service.h
index 5e5286b406379f534c89e333fb79327c7d590ed8..8c21f80ece948c4ebf37a44191fda09d1813f941 100644
--- a/chrome/browser/notifications/notification_display_service.h
+++ b/chrome/browser/notifications/notification_display_service.h
@@ -61,11 +61,6 @@
                                     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);