Clean up forward declarations in Source/core/css

Source/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 10 matching lines @@
 #ifndef CSSStyleDeclaration_h
 #define CSSStyleDeclaration_h
 
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "core/CSSPropertyNames.h"
 #include "wtf/Forward.h"
 #include "wtf/Noncopyable.h"
 
 namespace blink {
 
-class CSSProperty;
 class CSSRule;
 class CSSStyleSheet;
 class CSSValue;
 class ExceptionState;
 class MutableStylePropertySet;
 
 class CSSStyleDeclaration : public NoBaseWillBeGarbageCollectedFinalized<CSSStyleDeclaration>, public ScriptWrappable {
     DEFINE_WRAPPERTYPEINFO();
     WTF_MAKE_NONCOPYABLE(CSSStyleDeclaration); WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
 public:
@@ skipping 34 matching lines @@
 protected:
     CSSStyleDeclaration()
     {
         ScriptWrappable::init(this);
     }
 };
 
 } // namespace blink
 
 #endif // CSSStyleDeclaration_h