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

Source/core/html/parser/HTMLResourcePreloader.cpp

 /*
  * Copyright (C) 2013 Google Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 57 matching lines @@
 {
     PreloadRequestStream requests;
     requests.swap(r);
 
     for (PreloadRequestStream::iterator it = requests.begin(); it != requests.end(); ++it)
         preload(it->release());
 }
 
 static bool mediaAttributeMatches(LocalFrame* frame, RenderStyle* renderStyle, const String& attributeValue)
 {
-    RefPtr<MediaQuerySet> mediaQueries = MediaQuerySet::create(attributeValue);
+    RefPtrWillBeRawPtr<MediaQuerySet> mediaQueries = MediaQuerySet::create(attributeValue);
     MediaQueryEvaluator mediaQueryEvaluator("screen", frame, renderStyle);
     return mediaQueryEvaluator.eval(mediaQueries.get());
 }
 
 void HTMLResourcePreloader::preload(PassOwnPtr<PreloadRequest> preload)
 {
     Document* executingDocument = m_document->import() ? m_document->import()->master() : m_document;
     Document* loadingDocument = m_document;
 
     ASSERT(executingDocument->frame());
     ASSERT(executingDocument->renderer());
     ASSERT(executingDocument->renderer()->style());
     if (!preload->media().isEmpty() && !mediaAttributeMatches(executingDocument->frame(), executingDocument->renderer()->style(), preload->media()))
         return;
 
     FetchRequest request = preload->resourceRequest(m_document);
     blink::Platform::current()->histogramCustomCounts("WebCore.PreloadDelayMs", static_cast<int>(1000 * (monotonicallyIncreasingTime() - preload->discoveryTime())), 0, 2000, 20);
     loadingDocument->fetcher()->preload(preload->resourceType(), request, preload->charset());
 }
 
 
 }