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

Source/core/css/StyleRuleImport.h

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * (C) 2002-2003 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2002, 2006, 2008, 2012 Apple 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
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 18 matching lines @@
 
 namespace WebCore {
 
 class CSSStyleSheetResource;
 class MediaQuerySet;
 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();
 
     StyleSheetContents* parentStyleSheet() const { return m_parentStyleSheet; }
     void setParentStyleSheet(StyleSheetContents* sheet) { ASSERT(sheet); m_parentStyleSheet = sheet; }
     void clearParentStyleSheet() { m_parentStyleSheet = nullptr; }
 
     String href() const { return m_strHref; }
     StyleSheetContents* styleSheet() const { return m_styleSheet.get(); }
 
@@ skipping 16 matching lines @@
         {
             m_ownerRule->setCSSStyleSheet(href, baseURL, charset, sheet);
         }
     private:
         StyleRuleImport* m_ownerRule;
     };
 
     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;
 };
 
 DEFINE_STYLE_RULE_TYPE_CASTS(Import);
 
 } // namespace WebCore
 
 #endif