Remove some dead code from rendering/ folder

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 29 matching lines @@
 class TimingFunction;
 
 class KeyframeValue {
 public:
     KeyframeValue(double key, PassRefPtr<RenderStyle> style)
         : m_key(key)
         , m_style(style)
     {
     }
 
-    void addProperties(const StylePropertySet*);
     void addProperty(CSSPropertyID prop) { m_properties.add(prop); }
     bool containsProperty(CSSPropertyID prop) const { return m_properties.contains(prop); }
     const HashSet<CSSPropertyID>& properties() const { return m_properties; }
 
     double key() const { return m_key; }
     void setKey(double key) { m_key = key; }
 
     const RenderStyle* style() const { return m_style.get(); }
     void setStyle(PassRefPtr<RenderStyle> style) { m_style = style; }
 
@@ skipping 31 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