Use [ImplementedAs=domWindow] for Document.defaultView()

Source/core/dom/Document.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
@@ skipping 673 matching lines @@
     void nodeWillBeRemoved(Node*);
     bool canReplaceChild(Node* newChild, Node* oldChild);
 
     void didInsertText(Node*, unsigned offset, unsigned length);
     void didRemoveText(Node*, unsigned offset, unsigned length);
     void didMergeTextNodes(Text* oldNode, unsigned offset);
     void didSplitTextNode(Text* oldNode);
 
     void setDOMWindow(DOMWindow* domWindow) { m_domWindow = domWindow; }
     DOMWindow* domWindow() const { return m_domWindow; }
-    // In DOM Level 2, the Document's DOMWindow is called the defaultView.
-    DOMWindow* defaultView() const { return domWindow(); }
 
     // Helper functions for forwarding DOMWindow event related tasks to the DOMWindow if it exists.
     void setWindowAttributeEventListener(const AtomicString& eventType, PassRefPtr<EventListener>, DOMWrapperWorld* isolatedWorld = 0);
     EventListener* getWindowAttributeEventListener(const AtomicString& eventType, DOMWrapperWorld* isolatedWorld);
     void dispatchWindowEvent(PassRefPtr<Event>, PassRefPtr<EventTarget> = 0);
 
     PassRefPtr<Event> createEvent(const String& eventType, ExceptionState&);
 
     // keep track of what types of event listeners are registered, so we don't
     // dispatch events unnecessarily
@@ skipping 704 matching lines @@
 inline bool Node::isDocumentNode() const
 {
     return this == documentInternal();
 }
 
 Node* eventTargetNodeForDocument(Document*);
 
 } // namespace WebCore
 
 #endif // Document_h