Clean up forward declarations in Source/core/html

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 11 matching lines @@
 
 #ifndef HTMLDocument_h
 #define HTMLDocument_h
 
 #include "core/dom/Document.h"
 #include "core/fetch/ResourceClient.h"
 #include "wtf/HashCountedSet.h"
 
 namespace blink {
 
-class FrameView;
 class HTMLBodyElement;
-class HTMLElement;
 
 class HTMLDocument : public Document, public ResourceClient {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static PassRefPtrWillBeRawPtr<HTMLDocument> create(const DocumentInit& initializer = DocumentInit())
     {
         return adoptRefWillBeNoop(new HTMLDocument(initializer));
     }
     virtual ~HTMLDocument();
 
@@ skipping 54 matching lines @@
 inline bool HTMLDocument::hasExtraNamedItem(const AtomicString& name)
 {
     return m_extraNamedItemCounts.contains(name);
 }
 
 DEFINE_DOCUMENT_TYPE_CASTS(HTMLDocument);
 
 } // namespace blink
 
 #endif // HTMLDocument_h