Extract a DOMWindow interface from LocalDOMWindow and use it in the idl.

Source/core/html/HTMLFrameOwnerElement.cpp

 /*
  * Copyright (C) 2006, 2007, 2009 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 159 matching lines @@
     // An owner must by now have been informed of detachment
     // when the frame was closed.
     ASSERT(!m_contentFrame);
 }
 
 Document* HTMLFrameOwnerElement::contentDocument() const
 {
     return (m_contentFrame && m_contentFrame->isLocalFrame()) ? toLocalFrame(m_contentFrame)->document() : 0;
 }
 
-LocalDOMWindow* HTMLFrameOwnerElement::contentWindow() const
+DOMWindow* HTMLFrameOwnerElement::contentWindow() const
 {
     return m_contentFrame ? m_contentFrame->domWindow() : 0;
 }
 
 void HTMLFrameOwnerElement::setSandboxFlags(SandboxFlags flags)
 {
     m_sandboxFlags = flags;
 }
 
 bool HTMLFrameOwnerElement::isKeyboardFocusable() const
@@ skipping 70 matching lines @@
 void HTMLFrameOwnerElement::trace(Visitor* visitor)
 {
     visitor->trace(m_contentFrame);
     visitor->trace(m_widget);
     HTMLElement::trace(visitor);
     FrameOwner::trace(visitor);
 }
 
 
 } // namespace blink