Make DOMWindowProperty::m_frame private

third_party/WebKit/Source/core/frame/DOMWindowProperty.h

 /*
  * Copyright (C) 2011 Google, 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 26 matching lines @@
 class CORE_EXPORT DOMWindowProperty : public GarbageCollectedMixin {
 public:
     explicit DOMWindowProperty(LocalFrame*);
 
     virtual void frameDestroyed();
 
     LocalFrame* frame() const { return m_frame; }
 
     DECLARE_VIRTUAL_TRACE();
 
-protected:
+private:
     Member<LocalFrame> m_frame;
 };
 
 } // namespace blink
 
 #endif // DOMWindowProperty_h