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

Source/core/css/StyleRuleImport.h

Index: Source/core/css/StyleRuleImport.h
diff --git a/Source/core/css/StyleRuleImport.h b/Source/core/css/StyleRuleImport.h
index ec9a0003c8a8f2eab8a00c494afebcb807370690..ad08e1223485f7dd580bbf43f06272436dc45e9e 100644
--- a/Source/core/css/StyleRuleImport.h
+++ b/Source/core/css/StyleRuleImport.h
@@ -36,7 +36,7 @@ class StyleSheetContents;
 class StyleRuleImport : public StyleRuleBase {
     WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
 public:
-    static PassRefPtrWillBeRawPtr<StyleRuleImport> create(const String& href, PassRefPtr<MediaQuerySet>);
+    static PassRefPtrWillBeRawPtr<StyleRuleImport> create(const String& href, PassRefPtrWillBeRawPtr<MediaQuerySet>);
 
     ~StyleRuleImport();
 
@@ -73,13 +73,13 @@ private:
     void setCSSStyleSheet(const String& href, const KURL& baseURL, const String& charset, const CSSStyleSheetResource*);
     friend class ImportedStyleSheetClient;
 
-    StyleRuleImport(const String& href, PassRefPtr<MediaQuerySet>);
+    StyleRuleImport(const String& href, PassRefPtrWillBeRawPtr<MediaQuerySet>);
 
     RawPtrWillBeMember<StyleSheetContents> m_parentStyleSheet;
 
     ImportedStyleSheetClient m_styleSheetClient;
     String m_strHref;
-    RefPtr<MediaQuerySet> m_mediaQueries;
+    RefPtrWillBeMember<MediaQuerySet> m_mediaQueries;
     RefPtrWillBeMember<StyleSheetContents> m_styleSheet;
     ResourcePtr<CSSStyleSheetResource> m_resource;
     bool m_loading;