Reduce forward declarations in core/rendering

Source/core/rendering/RenderTheme.h

 /*
  * This file is part of the theme implementation for form controls in WebCore.
  *
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Computer, Inc.
  *
  * 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 19 matching lines @@
 #endif
 #include "core/rendering/RenderObject.h"
 #include "core/rendering/style/CachedUAStyle.h"
 #include "platform/scroll/ScrollTypes.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
 #include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
-class CSSStyleSheet;
 class Element;
 class FileList;
 class HTMLInputElement;
-class PopupMenu;
-class RenderMenuList;
 class RenderMeter;
 class RenderProgress;
 
 
 class RenderTheme : public RefCounted<RenderTheme> {
 protected:
     RenderTheme();
 
 public:
     virtual ~RenderTheme() { }
@@ skipping 254 matching lines @@
     static const RGBA32 defaultCompositionBackgroundColor = 0xFFFFDD55;
 
 #if USE(NEW_THEME)
     Theme* m_platformTheme; // The platform-specific theme.
 #endif
 };
 
 } // namespace WebCore
 
 #endif // RenderTheme_h