Clean up forward declarations in Source/core/css

Source/core/css/MediaQueryEvaluator.h

 /*
  * CSS Media Query Evaluator
  *
  * Copyright (C) 2006 Kimmo Kinnunen <kimmo.t.kinnunen@nokia.com>.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 20 matching lines @@
 #include "platform/heap/Handle.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 class LocalFrame;
 class MediaQuery;
 class MediaQueryExp;
 class MediaQueryResult;
 class MediaQuerySet;
 class MediaValues;
-class RenderStyle;
 
 typedef WillBeHeapVector<RefPtrWillBeMember<MediaQueryResult> > MediaQueryResultList;
 
 // Class that evaluates css media queries as defined in
 // CSS3 Module "Media Queries" (http://www.w3.org/TR/css3-mediaqueries/)
 // Special constructors are needed, if simple media queries are to be
 // evaluated without knowledge of the medium features. This can happen
 // for example when parsing UA stylesheets, if evaluation is done
 // right after parsing.
 //
@@ skipping 38 matching lines @@
 private:
     const String mediaType() const;
 
     String m_mediaType;
     bool m_expectedResult;
     RefPtr<MediaValues> m_mediaValues;
 };
 
 } // namespace
 #endif