Improved parse error handling for CSSMQ.

Source/core/css/MediaList.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2006, 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 185 matching lines @@
         }
     }
     return false;
 }
 
 void MediaQuerySet::addMediaQuery(PassOwnPtr<MediaQuery> mediaQuery)
 {
     m_queries.append(mediaQuery);
 }
 
+void MediaQuerySet::replaceLastMediaQuery(PassOwnPtr<MediaQuery> mediaQuery)
+{
+    m_queries.removeLast();
+    m_queries.append(mediaQuery);
+}
+
 String MediaQuerySet::mediaText() const
 {
     StringBuilder text;
     
     bool first = true;
     for (size_t i = 0; i < m_queries.size(); ++i) {
         if (!first)
             text.appendLiteral(", ");
         else
             first = false;
@@ skipping 139 matching lines @@
                             addResolutionWarningMessageToConsole(document, mediaQuerySet->mediaText(), primitiveValue);
                     }
                 }
             }
         }
     }
 }
 #endif
 
 }