Clean up forward declarations in Source/core/css

Source/core/css/CSSStyleSheet.h

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2006, 2007, 2008, 2009, 2010, 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 CSSStyleSheet_h
 
 #include "core/css/CSSRule.h"
 #include "core/css/StyleSheet.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/text/TextPosition.h"
 
 namespace blink {
 
-class CSSCharsetRule;
 class CSSImportRule;
-class BisonCSSParser;
 class CSSRule;
 class CSSRuleList;
 class CSSStyleSheet;
-class CSSStyleSheetResource;
 class Document;
 class ExceptionState;
 class MediaQuerySet;
-class SecurityOrigin;
 class StyleSheetContents;
 
 enum StyleSheetUpdateType {
     PartialRuleUpdate,
     EntireStyleSheetUpdate
 };
 
 class CSSStyleSheet FINAL : public StyleSheet {
     DEFINE_WRAPPERTYPEINFO();
 public:
@@ skipping 115 matching lines @@
 {
     if (m_styleSheet)
         m_styleSheet->didMutateRules();
 }
 
 DEFINE_TYPE_CASTS(CSSStyleSheet, StyleSheet, sheet, sheet->isCSSStyleSheet(), sheet.isCSSStyleSheet());
 
 } // namespace blink
 
 #endif