A thread-safe Media Query Parser

Source/core/css/MediaQuery.h

Index: Source/core/css/MediaQuery.h
diff --git a/Source/core/css/MediaQuery.h b/Source/core/css/MediaQuery.h
index fa5463ee7dff79b5abdc0a394c4fb28645822606..373709024ec97fe8fb91b9385cf39aaded84501d 100644
--- a/Source/core/css/MediaQuery.h
+++ b/Source/core/css/MediaQuery.h
@@ -46,12 +46,12 @@ public:
         Only, Not, None
     };
 
-    MediaQuery(Restrictor, const AtomicString& mediaType, PassOwnPtr<ExpressionVector> exprs);
+    MediaQuery(Restrictor, const String& mediaType, PassOwnPtr<ExpressionVector> exprs);
     ~MediaQuery();
 
     Restrictor restrictor() const { return m_restrictor; }
     const ExpressionVector& expressions() const { return *m_expressions; }
-    const AtomicString& mediaType() const { return m_mediaType; }
+    const String& mediaType() const { return m_mediaType; }
     bool operator==(const MediaQuery& other) const;
     String cssText() const;
 
@@ -61,7 +61,7 @@ private:
     MediaQuery(const MediaQuery&);
 
     Restrictor m_restrictor;
-    AtomicString m_mediaType;
+    String m_mediaType;
     OwnPtr<ExpressionVector> m_expressions;
     String m_serializationCache;