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

Source/core/frame/Frame.h

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999-2001 Lars Knoll <knoll@kde.org>
  *                     1999-2001 Antti Koivisto <koivisto@kde.org>
  *                     2000-2001 Simon Hausmann <hausmann@kde.org>
  *                     2000-2001 Dirk Mueller <mueller@kde.org>
  *                     2000 Stefan Schimanski <1Stein@gmx.de>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
@@ skipping 23 matching lines @@
 #include "wtf/RefCounted.h"
 
 namespace blink {
 
 class ChromeClient;
 class Document;
 class FrameClient;
 class FrameHost;
 class FrameOwner;
 class HTMLFrameOwnerElement;
-class LocalDOMWindow;
+class DOMWindow;
 class KURL;
 class Page;
 class RenderPart;
 class Settings;
 class WebLayer;
 
 struct Referrer;
 
 class Frame : public RefCountedWillBeGarbageCollectedFinalized<Frame> {
 public:
     virtual ~Frame();
 
     virtual void trace(Visitor*);
 
     virtual bool isLocalFrame() const { return false; }
     virtual bool isRemoteFrame() const { return false; }
 
-    // FIXME: This should return a DOMWindow*.
-    virtual LocalDOMWindow* domWindow() const = 0;
+    virtual DOMWindow* domWindow() const = 0;
 
     virtual void navigate(Document& originDocument, const KURL&, bool lockBackForwardList) = 0;
 
     virtual void detach();
     void detachChildren();
     virtual void disconnectOwnerElement();
 
     FrameClient* client() const;
 
     // NOTE: Page is moving out of Blink up into the browser process as
@@ skipping 53 matching lines @@
 {
     return m_treeNode;
 }
 
 // Allow equality comparisons of Frames by reference or pointer, interchangeably.
 DEFINE_COMPARISON_OPERATORS_WITH_REFERENCES_REFCOUNTED(Frame)
 
 } // namespace blink
 
 #endif // Frame_h