Fix MQEvaluator::mediaType() related perf regressions.

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 287 matching lines @@
     // between various parts of machinery smells wrong. This needs to be better somehow.
     RuleFeatureSet m_features;
     OwnPtrWillBeMember<RuleSet> m_siblingRuleSet;
     OwnPtrWillBeMember<RuleSet> m_uncommonAttributeRuleSet;
 
     // FIXME: watched selectors should be implemented using injected author stylesheets: http://crbug.com/316960
     OwnPtrWillBeMember<RuleSet> m_watchedSelectorsRules;
     TreeBoundaryCrossingRules m_treeBoundaryCrossingRules;
 
     bool m_needCollectFeatures;
+    bool m_printMediaType;
 
     StyleResourceLoader m_styleResourceLoader;
 
     unsigned m_styleSharingDepth;
     WillBeHeapVector<OwnPtrWillBeMember<StyleSharingList>, styleSharingMaxDepth> m_styleSharingLists;
 
     OwnPtr<StyleResolverStats> m_styleResolverStats;
     OwnPtr<StyleResolverStats> m_styleResolverStatsTotals;
     unsigned m_styleResolverStatsSequence;
 
     // Use only for Internals::updateStyleAndReturnAffectedElementCount.
     unsigned m_accessCount;
 };
 
 } // namespace blink
 
 #endif // StyleResolver_h