include RefCounted.h where needed, only.

third_party/WebKit/Source/core/css/ElementRuleCollector.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 ElementRuleCollector_h
 #define ElementRuleCollector_h
 
 #include "core/css/PseudoStyleRequest.h"
 #include "core/css/SelectorChecker.h"
 #include "core/css/resolver/ElementResolveContext.h"
 #include "core/css/resolver/MatchRequest.h"
 #include "core/css/resolver/MatchResult.h"
+#include "wtf/RefCounted.h"
 #include "wtf/RefPtr.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
 class CSSStyleSheet;
 class CSSRuleList;
 class RuleData;
 class RuleSet;
 class SelectorFilter;
@@ skipping 123 matching lines @@
 
     // Output.
     Member<StaticCSSRuleList> m_cssRuleList;
     Member<StyleRuleList> m_styleRuleList;
     MatchResult m_result;
 };
 
 } // namespace blink
 
 #endif // ElementRuleCollector_h