Notification should not leak document.

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 105 matching lines @@
     void dispatchCloseEvent();
     void dispatchErrorEvent();
     void dispatchShowEvent();
 
     using RefCounted<Notification>::ref;
     using RefCounted<Notification>::deref;
 
     // EventTarget interface
     virtual const AtomicString& interfaceName() const;
     virtual ScriptExecutionContext* scriptExecutionContext() const { return ActiveDOMObject::scriptExecutionContext(); }
+    virtual bool dispatchEvent(PassRefPtr<Event>);
 
     // ActiveDOMObject interface
     virtual void contextDestroyed();
 
     void stopLoadingIcon();
 
     // Deprecated. Use functions from NotificationCenter.
     void detachPresenter() { }
 
     void finalize();
@@ skipping 51 matching lines @@
 #if ENABLE(NOTIFICATIONS)
     OwnPtr<Timer<Notification> > m_taskTimer;
 #endif
 };
 
 } // namespace WebCore
 
 #endif // ENABLE(NOTIFICATIONS) || ENABLE(LEGACY_NOTIFICATIONS)
 
 #endif // Notifications_h