Clean up forward declarations in Source/core/html

Source/core/html/HTMLMarqueeElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2007, 2010 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 HTMLMarqueeElement_h
 #define HTMLMarqueeElement_h
 
 #include "core/dom/ActiveDOMObject.h"
 #include "core/html/HTMLElement.h"
 #include "platform/Timer.h"
 
 namespace blink {
 
-class ExceptionState;
 class RenderMarquee;
 
 class HTMLMarqueeElement FINAL : public HTMLElement, private ActiveDOMObject {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static PassRefPtrWillBeRawPtr<HTMLMarqueeElement> create(Document&);
 
     int minimumDelay() const;
 
     // DOM Functions
@@ skipping 16 matching lines @@
     virtual void resume() OVERRIDE;
 
     virtual RenderObject* createRenderer(RenderStyle*) OVERRIDE;
 
     RenderMarquee* renderMarquee() const;
 };
 
 } // namespace blink
 
 #endif // HTMLMarqueeElement_h