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

Source/core/html/parser/HTMLResourcePreloader.cpp

Index: Source/core/html/parser/HTMLResourcePreloader.cpp
diff --git a/Source/core/html/parser/HTMLResourcePreloader.cpp b/Source/core/html/parser/HTMLResourcePreloader.cpp
index 9f8b7375dd84ecfccb741da4111a8628ee2f100f..68e72179cce95470e0821518811c9321bf064e12 100644
--- a/Source/core/html/parser/HTMLResourcePreloader.cpp
+++ b/Source/core/html/parser/HTMLResourcePreloader.cpp
@@ -75,7 +75,7 @@ void HTMLResourcePreloader::takeAndPreload(PreloadRequestStream& r)
 
 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());
 }