Remove MediaValues' dependency on RenderStyle

Source/core/css/resolver/StyleResolver.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,
@@ skipping 281 matching lines @@
 
     static RenderStyle* s_styleNotYetAvailable;
 
     void cacheBorderAndBackground();
 
     MatchedPropertiesCache m_matchedPropertiesCache;
 
     OwnPtr<MediaQueryEvaluator> m_medium;
     MediaQueryResultList m_viewportDependentMediaQueryResults;
 
-    RefPtr<RenderStyle> m_rootDefaultStyle;
-
     Document& m_document;
     SelectorFilter m_selectorFilter;
 
     OwnPtrWillBeMember<ViewportStyleResolver> m_viewportStyleResolver;
 
     // FIXME: Oilpan: This should be a WillBeHeapListHashSet.
     // This is safe for now, but should be updated when we support
     // heap allocated ListHashSets.
     ListHashSet<CSSStyleSheet*, 16> m_pendingStyleSheets;
 
@@ skipping 19 matching lines @@
     OwnPtr<StyleResolverStats> m_styleResolverStatsTotals;
     unsigned m_styleResolverStatsSequence;
 
     // Use only for Internals::updateStyleAndReturnAffectedElementCount.
     unsigned m_accessCount;
 };
 
 } // namespace WebCore
 
 #endif // StyleResolver_h