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

Source/core/html/HTMLLinkElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Rob Buis (rwlbuis@gmail.com)
  * Copyright (C) 2011 Google 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
@@ skipping 566 matching lines @@
         if (!m_owner->shouldLoadLink())
             return;
 
         m_loading = true;
 
         bool mediaQueryMatches = true;
         if (!m_owner->media().isEmpty()) {
             LocalFrame* frame = loadingFrame();
             if (Document* document = loadingFrame()->document()) {
                 RefPtr<RenderStyle> documentStyle = StyleResolver::styleForDocument(*document);
-                RefPtr<MediaQuerySet> media = MediaQuerySet::create(m_owner->media());
+                RefPtrWillBeRawPtr<MediaQuerySet> media = MediaQuerySet::create(m_owner->media());
                 MediaQueryEvaluator evaluator(frame->view()->mediaType(), frame, documentStyle.get());
                 mediaQueryMatches = evaluator.eval(media.get());
             }
         }
 
         // Don't hold up render tree construction and script execution on stylesheets
         // that are not needed for the rendering at the moment.
         bool blocking = mediaQueryMatches && !m_owner->isAlternate();
         addPendingSheet(blocking ? Blocking : NonBlocking);
 
@@ skipping 28 matching lines @@
 void LinkStyle::ownerRemoved()
 {
     if (m_sheet)
         clearSheet();
 
     if (styleSheetIsLoading())
         removePendingSheet(RemovePendingSheetNotifyLater);
 }
 
 } // namespace WebCore