Reduce forward declarations in core/rendering

Source/core/rendering/style/KeyframeList.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *
  * 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 18 matching lines @@
 #include "core/rendering/style/StyleInheritedData.h"
 #include "wtf/HashSet.h"
 #include "wtf/RefPtr.h"
 #include "wtf/Vector.h"
 #include "wtf/text/AtomicString.h"
 
 namespace WebCore {
 
 class RenderObject;
 class RenderStyle;
-class StylePropertySet;
-class TimingFunction;
 
 class KeyframeValue {
 public:
     KeyframeValue(double key, PassRefPtr<RenderStyle> style)
         : m_key(key)
         , m_style(style)
     {
     }
 
     void addProperty(CSSPropertyID prop) { m_properties.add(prop); }
@@ skipping 38 matching lines @@
 
 private:
     AtomicString m_animationName;
     Vector<KeyframeValue> m_keyframes; // Kept sorted by key.
     HashSet<CSSPropertyID> m_properties; // The properties being animated.
 };
 
 } // namespace WebCore
 
 #endif // KeyframeList_h