Change various helper classes to transition types to get CSSValue entirely onto the gc heap.

Source/core/css/CSSStyleSheet.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2006, 2007, 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 181 matching lines @@
 
 void CSSStyleSheet::setDisabled(bool disabled)
 {
     if (disabled == m_isDisabled)
         return;
     m_isDisabled = disabled;
 
     didMutate();
 }
 
-void CSSStyleSheet::setMediaQueries(PassRefPtr<MediaQuerySet> mediaQueries)
+void CSSStyleSheet::setMediaQueries(PassRefPtrWillBeRawPtr<MediaQuerySet> mediaQueries)
 {
     m_mediaQueries = mediaQueries;
     if (m_mediaCSSOMWrapper && m_mediaQueries)
         m_mediaCSSOMWrapper->reattach(m_mediaQueries.get());
 
     // Add warning message to inspector whenever dpi/dpcm values are used for "screen" media.
     reportMediaQueryWarningIfNeeded(ownerDocument(), m_mediaQueries.get());
 }
 
 unsigned CSSStyleSheet::length() const
@@ skipping 187 matching lines @@
     return m_loadCompleted;
 }
 
 void CSSStyleSheet::startLoadingDynamicSheet()
 {
     m_loadCompleted = false;
     m_ownerNode->startLoadingDynamicSheet();
 }
 
 }