Move 'designMode' attribute from HTMLDocument to Document

Source/core/html/HTMLDocument.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2006, 2007, 2008, 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.
  *
@@ skipping 23 matching lines @@
 class HTMLElement;
 
 class HTMLDocument : public Document, public ResourceClient {
 public:
     static PassRefPtr<HTMLDocument> create(const DocumentInit& initializer = DocumentInit())
     {
         return adoptRef(new HTMLDocument(initializer));
     }
     virtual ~HTMLDocument();
 
-    String designMode() const;
-    void setDesignMode(const String&);
-
     const AtomicString& bgColor() const;
     void setBgColor(const AtomicString&);
     const AtomicString& fgColor() const;
     void setFgColor(const AtomicString&);
     const AtomicString& alinkColor() const;
     void setAlinkColor(const AtomicString&);
     const AtomicString& linkColor() const;
     void setLinkColor(const AtomicString&);
     const AtomicString& vlinkColor() const;
     void setVlinkColor(const AtomicString&);
@@ skipping 44 matching lines @@
 inline bool HTMLDocument::hasExtraNamedItem(const AtomicString& name)
 {
     return m_extraNamedItemCounts.contains(name);
 }
 
 DEFINE_DOCUMENT_TYPE_CASTS(HTMLDocument);
 
 } // namespace WebCore
 
 #endif // HTMLDocument_h