Make IDL Callbacks non-refcounted by default

Source/modules/notifications/Notification.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2009, 2011, 2012 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 109 matching lines @@
     virtual ExecutionContext* executionContext() const OVERRIDE { return ActiveDOMObject::executionContext(); }
     virtual bool dispatchEvent(PassRefPtr<Event>) OVERRIDE;
 
     // ActiveDOMObject interface
     // Override to prevent this from being collected when in Showing state.
     virtual bool hasPendingActivity() const OVERRIDE;
     virtual void stop() OVERRIDE;
 
     static const String& permission(ExecutionContext*);
     static const String& permissionString(NotificationClient::Permission);
-    static void requestPermission(ExecutionContext*, PassRefPtr<NotificationPermissionCallback> = 0);
+    static void requestPermission(ExecutionContext*, PassOwnPtr<NotificationPermissionCallback> = nullptr);
 
 private:
 #if ENABLE(LEGACY_NOTIFICATIONS)
     Notification(const String& title, const String& body, const String& iconURI, ExecutionContext*, ExceptionState&, PassRefPtr<NotificationCenter>);
 #endif
     Notification(ExecutionContext*, const String& title);
 
     void setLang(const String& lang) { m_lang = lang; }
     void setBody(const String& body) { m_body = body; }
     void setIcon(const KURL& url) { m_icon = url; }
@@ skipping 18 matching lines @@
     NotificationState m_state;
 
     NotificationClient* m_notificationClient;
 
     OwnPtr<AsyncMethodRunner<Notification> > m_asyncRunner;
 };
 
 } // namespace WebCore
 
 #endif // Notifications_h