Ensure proper finalization of garbage-collected types.

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 45 matching lines @@
 {
 }
 
 MediaQuerySet::MediaQuerySet(const MediaQuerySet& o)
     : m_queries(o.m_queries.size())
 {
     for (unsigned i = 0; i < m_queries.size(); ++i)
         m_queries[i] = o.m_queries[i]->copy();
 }
 
-MediaQuerySet::~MediaQuerySet()
-{
-}
+DEFINE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(MediaQuerySet)
 
 PassRefPtrWillBeRawPtr<MediaQuerySet> MediaQuerySet::create(const String& mediaString)
 {
     if (mediaString.isEmpty())
         return MediaQuerySet::create();
 
     BisonCSSParser parser(strictCSSParserContext());
     return parser.parseMediaQueryList(mediaString);
 }
 
@@ skipping 222 matching lines @@
                     if ((primitiveValue->isDotsPerInch() || primitiveValue->isDotsPerCentimeter()) && !overriden.contains(expression->mediaFeature()))
                         addResolutionWarningMessageToConsole(document, mediaQuerySet->mediaText(), primitiveValue);
                 }
                 overriden.add(expression->mediaFeature());
             }
         }
     }
 }
 
 }