Remove the CSSOM.

sky/engine/core/css/ElementRuleCollector.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 14 matching lines @@
 #include "sky/engine/core/css/SelectorChecker.h"
 #include "sky/engine/core/css/resolver/ElementResolveContext.h"
 #include "sky/engine/core/css/resolver/MatchRequest.h"
 #include "sky/engine/core/css/resolver/MatchResult.h"
 #include "sky/engine/wtf/RefPtr.h"
 #include "sky/engine/wtf/Vector.h"
 
 namespace blink {
 
 class CSSStyleSheet;
-class CSSRuleList;
 class RuleData;
 class RuleSet;
 class ScopedStyleResolver;
-class StaticCSSRuleList;
 
 typedef unsigned CascadeScope;
 typedef unsigned CascadeOrder;
 
 const CascadeScope ignoreCascadeScope = 0;
 const CascadeOrder ignoreCascadeOrder = 0;
 
 class MatchedRule {
     ALLOW_ONLY_INLINE_ALLOCATION();
 public:
@@ skipping 88 matching lines @@
 
     OwnPtr<Vector<MatchedRule, 32> > m_matchedRules;
 
     // Output.
     MatchResult m_result;
 };
 
 } // namespace blink
 
 #endif  // SKY_ENGINE_CORE_CSS_ELEMENTRULECOLLECTOR_H_