Improved parse error handling for CSSMQ.

Source/core/css/MediaList.h

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2006, 2008, 2009, 2010, 2012 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 39 matching lines @@
     {
         return adoptRef(new MediaQuerySet(mediaString, true));
     }
     ~MediaQuerySet();
     
     bool parse(const String&);
     bool add(const String&);
     bool remove(const String&);
 
     void addMediaQuery(PassOwnPtr<MediaQuery>);
+    void replaceLastMediaQuery(PassOwnPtr<MediaQuery>);
 
     const Vector<OwnPtr<MediaQuery> >& queryVector() const { return m_queries; }
     
     int lastLine() const { return m_lastLine; }
     void setLastLine(int lastLine) { m_lastLine = lastLine; }
     
     String mediaText() const;
 
     PassRefPtr<MediaQuerySet> copy() const { return adoptRef(new MediaQuerySet(*this)); }
 
@@ skipping 52 matching lines @@
 };
 
 #if ENABLE(RESOLUTION_MEDIA_QUERY)
 // Adds message to inspector console whenever dpi or dpcm values are used for "screen" media.
 void reportMediaQueryWarningIfNeeded(Document*, const MediaQuerySet*);
 #endif
 
 } // namespace
 
 #endif