Reduce forward declarations in core/dom

Source/core/dom/Attr.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2004, 2005, 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
@@ skipping 12 matching lines @@
  */
 
 #ifndef Attr_h
 #define Attr_h
 
 #include "core/dom/ContainerNode.h"
 #include "core/dom/QualifiedName.h"
 
 namespace WebCore {
 
-class ExceptionState;
-
 // Attr can have Text children
 // therefore it has to be a fullblown Node. The plan
 // is to dynamically allocate a textchild and store the
 // resulting nodevalue in the attribute upon
 // destruction. however, this is not yet implemented.
 
 class Attr FINAL : public ContainerNode {
 public:
     static PassRefPtrWillBeRawPtr<Attr> create(Element&, const QualifiedName&);
     static PassRefPtrWillBeRawPtr<Attr> create(Document&, const QualifiedName&, const AtomicString& value);
@@ skipping 52 matching lines @@
     // use a single field.
     AtomicString m_standaloneValueOrAttachedLocalName;
     unsigned m_ignoreChildrenChanged;
 };
 
 DEFINE_NODE_TYPE_CASTS(Attr, isAttributeNode());
 
 } // namespace WebCore
 
 #endif // Attr_h