Clean up forward declarations in WebKit/Source

Source/core/css/resolver/StyleResolver.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 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.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 40 matching lines @@
 class Document;
 class Element;
 class ElementRuleCollector;
 class Interpolation;
 class MediaQueryEvaluator;
 class RuleData;
 class StyleKeyframe;
 class StylePropertySet;
 class StyleResolverStats;
 class StyleRule;
-class StyleRuleKeyframes;
 class StyleRulePage;
 class ViewportStyleResolver;
 
 class MatchResult;
 
 enum StyleSharingBehavior {
     AllowStyleSharing,
     DisallowStyleSharing,
 };
 
@@ skipping 229 matching lines @@
     OwnPtr<StyleResolverStats> m_styleResolverStatsTotals;
     unsigned m_styleResolverStatsSequence;
 
     // Use only for Internals::updateStyleAndReturnAffectedElementCount.
     unsigned m_accessCount;
 };
 
 } // namespace blink
 
 #endif // StyleResolver_h