Clean up forward declarations in Source/core/css

Source/core/css/parser/CSSParserValues.h

 /*
  * Copyright (C) 2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2008, 2009, 2010 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 12 matching lines @@
 
 #include "core/CSSValueKeywords.h"
 #include "core/css/CSSPrimitiveValue.h"
 #include "core/css/CSSSelector.h"
 #include "core/css/CSSValueList.h"
 #include "wtf/text/AtomicString.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
-class CSSValue;
 class QualifiedName;
 
 struct CSSParserString {
     void init(const LChar* characters, unsigned length)
     {
         m_data.characters8 = characters;
         m_length = length;
         m_is8Bit = true;
     }
 
@@ skipping 236 matching lines @@
 {
     id = CSSValueInvalid;
     this->valueList = valueList.leakPtr();
     unit = ValueList;
     isInt = false;
 }
 
 }
 
 #endif