Clean up forward declarations in WebKit/Source

Source/core/css/parser/BisonCSSParser.h

 /*
  * Copyright (C) 2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 - 2010  Torch Mobile (Beijing) Co. Ltd. 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.
@@ skipping 31 matching lines @@
 #include "wtf/HashSet.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/Vector.h"
 #include "wtf/text/AtomicString.h"
 #include "wtf/text/TextPosition.h"
 
 namespace blink {
 
 class CSSSelectorList;
 class CSSValue;
-class CSSValueList;
-class Document;
 class Element;
 class ImmutableStylePropertySet;
 class MediaQueryExp;
 class MediaQuerySet;
 class MutableStylePropertySet;
 class StyleColor;
 class StyleKeyframe;
 class StyleRuleBase;
 class StyleRuleKeyframes;
 class StyleKeyframe;
@@ skipping 246 matching lines @@
 inline int cssyylex(void* yylval, BisonCSSParser* parser)
 {
     return parser->m_tokenizer.lex(yylval);
 }
 
 bool isValidNthToken(const CSSParserString&);
 
 } // namespace blink
 
 #endif // BisonCSSParser_h