Revert of Deprecate native and extension notification delegates.

chrome/browser/notifications/notification_display_service.cc

Index: chrome/browser/notifications/notification_display_service.cc
diff --git a/chrome/browser/notifications/notification_display_service.cc b/chrome/browser/notifications/notification_display_service.cc
index 09a509dc5cfadc9bb710e0e724d6a8c1f95ec0fc..885b204c5224a7b472136616bb359885bff87d6a 100644
--- a/chrome/browser/notifications/notification_display_service.cc
+++ b/chrome/browser/notifications/notification_display_service.cc
@@ -10,7 +10,6 @@
 #include "chrome/browser/notifications/notification_common.h"
 #include "chrome/browser/notifications/persistent_notification_handler.h"
 #include "extensions/features/features.h"
-#include "url/gurl.h"
 
 #if BUILDFLAG(ENABLE_EXTENSIONS)
 #include "chrome/browser/extensions/api/notifications/extension_notification_handler.h"
@@ -72,11 +71,3 @@
       break;
   }
 }
-
-bool NotificationDisplayService::ShouldDisplayOverFullscreen(
-    const GURL& origin,
-    NotificationCommon::Type notification_type) {
-  NotificationHandler* handler = GetNotificationHandler(notification_type);
-  DCHECK(handler);
-  return handler->ShouldDisplayOnFullScreen(profile_, origin.spec());
-}