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

Source/core/dom/StyleElement.cpp

Index: Source/core/dom/StyleElement.cpp
diff --git a/Source/core/dom/StyleElement.cpp b/Source/core/dom/StyleElement.cpp
index e744c9bc4318c1a673edc918f33598ba05c8b534..e78a4c3d654cedf0dd20023ddab18014785655fe 100644
--- a/Source/core/dom/StyleElement.cpp
+++ b/Source/core/dom/StyleElement.cpp
@@ -130,7 +130,7 @@ void StyleElement::createSheet(Element* e, const String& text)
     const AtomicString& type = this->type();
     bool passesContentSecurityPolicyChecks = document.contentSecurityPolicy()->allowStyleHash(text) || document.contentSecurityPolicy()->allowStyleNonce(e->fastGetAttribute(HTMLNames::nonceAttr)) || document.contentSecurityPolicy()->allowInlineStyle(e->document().url(), m_startPosition.m_line);
     if (isCSS(e, type) && passesContentSecurityPolicyChecks) {
-        RefPtr<MediaQuerySet> mediaQueries = MediaQuerySet::create(media());
+        RefPtrWillBeRawPtr<MediaQuerySet> mediaQueries = MediaQuerySet::create(media());
 
         MediaQueryEvaluator screenEval("screen", true);
         MediaQueryEvaluator printEval("print", true);