Fix MQEvaluator::mediaType() related perf regressions.

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 50 matching lines @@
 
     explicit MediaQueryEvaluator(bool mediaFeatureResult = false);
 
     // Creates evaluator which evaluates only simple media queries
     // Evaluator  returns true for acceptedMediaType and returns value of \mediafeatureResult
     // for any media features
 
     MediaQueryEvaluator(const char* acceptedMediaType, bool mediaFeatureResult = false);
 
     // Creates evaluator which evaluates full media queries
-    MediaQueryEvaluator(LocalFrame*);
+    explicit MediaQueryEvaluator(LocalFrame*);
 
     // Creates evaluator which evaluates in a thread-safe manner a subset of media values
-    MediaQueryEvaluator(const MediaValues&);
+    explicit MediaQueryEvaluator(const MediaValues&);
 
     ~MediaQueryEvaluator();
 
     bool mediaTypeMatch(const String& mediaTypeToMatch) const;
-    bool mediaTypeMatchSpecific(const char* mediaTypeToMatch) const;
 
     // Evaluates a list of media queries
     bool eval(const MediaQuerySet*, MediaQueryResultList* = 0) const;
 
     // Evaluates media query subexpression, ie "and (media-feature: value)" part
     bool eval(const MediaQueryExp*) const;
 
 private:
     const String mediaType() const;
 
     String m_mediaType;
     bool m_expectedResult;
     RefPtr<MediaValues> m_mediaValues;
 };
 
 } // namespace
 #endif