Clean up forward declarations in Source/core/css

Source/core/css/PageRuleCollector.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 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,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #ifndef PageRuleCollector_h
 #define PageRuleCollector_h
 
 #include "core/css/resolver/MatchResult.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
-class ElementResolveContext;
 class StyleRulePage;
 
 class PageRuleCollector {
     STACK_ALLOCATED();
 public:
     PageRuleCollector(const RenderStyle* rootElementStyle, int pageIndex);
 
     void matchPageRules(RuleSet* rules);
     MatchResult& matchedResult() { return m_result; }
 
 private:
     bool isLeftPage(const RenderStyle* rootElementStyle, int pageIndex) const;
     bool isRightPage(const RenderStyle* rootElementStyle, int pageIndex) const { return !isLeftPage(rootElementStyle, pageIndex); }
     bool isFirstPage(int pageIndex) const;
     String pageName(int pageIndex) const;
 
     void matchPageRulesForList(WillBeHeapVector<RawPtrWillBeMember<StyleRulePage> >& matchedRules, const WillBeHeapVector<RawPtrWillBeMember<StyleRulePage> >& rules, bool isLeftPage, bool isFirstPage, const String& pageName);
 
     const bool m_isLeftPage;
     const bool m_isFirstPage;
     const String m_pageName;
 
     MatchResult m_result;
 };
 
 } // namespace blink
 
 #endif // PageRuleCollector_h