No need to store invalid media queries.

Source/core/css/MediaQuery.h

 /*
  * CSS Media Query
  *
  * Copyright (C) 2006 Kimmo Kinnunen <kimmo.t.kinnunen@nokia.com>.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  *
  * 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
@@ skipping 36 matching lines @@
     typedef Vector<OwnPtr<MediaQueryExp> > ExpressionVector;
 
     MediaQuery(Restrictor, const String& mediaType, PassOwnPtr<ExpressionVector> exprs);
     ~MediaQuery();
 
     Restrictor restrictor() const { return m_restrictor; }
     const Vector<OwnPtr<MediaQueryExp> >* expressions() const { return m_expressions.get(); }
     String mediaType() const { return m_mediaType; }
     bool operator==(const MediaQuery& other) const;
     String cssText() const;
-    bool ignored() const { return m_ignored; }
 
     PassOwnPtr<MediaQuery> copy() const { return adoptPtr(new MediaQuery(*this)); }
 
     void reportMemoryUsage(MemoryObjectInfo*) const;
 
 private:
     MediaQuery(const MediaQuery&);
 
     Restrictor m_restrictor;
     String m_mediaType;
     OwnPtr<ExpressionVector> m_expressions;
-    bool m_ignored;
     String m_serializationCache;
 
     String serialize() const;
 };
 
 } // namespace
 
 #endif