Remove the CSSOM.

sky/engine/core/css/CSSStyleDeclaration.h

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2008, 2012 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 11 matching lines @@
 #define SKY_ENGINE_CORE_CSS_CSSSTYLEDECLARATION_H_
 
 #include "gen/sky/core/CSSPropertyNames.h"
 #include "sky/engine/bindings/core/v8/ScriptWrappable.h"
 #include "sky/engine/wtf/Forward.h"
 #include "sky/engine/wtf/Noncopyable.h"
 
 namespace blink {
 
 class CSSProperty;
-class CSSRule;
 class CSSStyleSheet;
 class CSSValue;
 class ExceptionState;
 class MutableStylePropertySet;
 
 class CSSStyleDeclaration : public ScriptWrappable {
     DEFINE_WRAPPERTYPEINFO();
     WTF_MAKE_NONCOPYABLE(CSSStyleDeclaration); WTF_MAKE_FAST_ALLOCATED;
 public:
     virtual ~CSSStyleDeclaration() { }
 
 #if !ENABLE(OILPAN)
     virtual void ref() = 0;
     virtual void deref() = 0;
 #endif
 
-    virtual CSSRule* parentRule() const = 0;
     virtual String cssText() const = 0;
     virtual void setCSSText(const String&, ExceptionState&) = 0;
     virtual unsigned length() const = 0;
     virtual String item(unsigned index) const = 0;
     virtual PassRefPtr<CSSValue> getPropertyCSSValue(const String& propertyName) = 0;
     virtual String getPropertyValue(const String& propertyName) = 0;
     virtual String getPropertyPriority(const String& propertyName) = 0;
     virtual String getPropertyShorthand(const String& propertyName) = 0;
     virtual bool isPropertyImplicit(const String& propertyName) = 0;
     virtual void setProperty(const String& propertyName, const String& value, const String& priority, ExceptionState&) = 0;
@@ skipping 13 matching lines @@
 
 protected:
     CSSStyleDeclaration()
     {
     }
 };
 
 } // namespace blink
 
 #endif  // SKY_ENGINE_CORE_CSS_CSSSTYLEDECLARATION_H_