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

Source/core/css/FontFace.h

 /*
  * 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 31 matching lines @@
 
 class CSSFontFace;
 class CSSValueList;
 class Dictionary;
 class Document;
 class ExceptionState;
 class FontFaceReadyPromiseResolver;
 class StylePropertySet;
 class StyleRuleFontFace;
 
-class FontFace : public RefCounted<FontFace> {
+class FontFace : public RefCountedWillBeRefCountedGarbageCollected<FontFace> {
+    DECLARE_GC_INFO;
 public:
     enum LoadStatus { Unloaded, Loading, Loaded, Error };
 
     static PassRefPtr<FontFace> create(ExecutionContext*, const AtomicString& family, const String& source, const Dictionary&, ExceptionState&);
     static PassRefPtr<FontFace> create(Document*, const StyleRuleFontFace*);
 
     ~FontFace();
 
     const AtomicString& family() const { return m_family; }
     String style() const;
@@ skipping 15 matching lines @@
     String status() const;
 
     void load(ExecutionContext*);
     ScriptPromise ready(ExecutionContext*);
 
     LoadStatus loadStatus() const { return m_status; }
     void setLoadStatus(LoadStatus);
     unsigned traitsMask() const;
     CSSFontFace* cssFontFace() { return m_cssFontFace.get(); }
 
+    void trace(Visitor*);
+
 private:
     FontFace(PassRefPtrWillBeRawPtr<CSSValue> source);
 
     void initCSSFontFace(Document*);
     void setPropertyFromString(const Document*, const String&, CSSPropertyID, ExceptionState&);
     bool setPropertyFromStyle(const StylePropertySet*, CSSPropertyID);
     bool setPropertyValue(PassRefPtrWillBeRawPtr<CSSValue>, CSSPropertyID);
     bool setFamilyValue(CSSValueList*);
     void resolveReadyPromises();
 
     AtomicString m_family;
-    RefPtr<CSSValue> m_src;
-    RefPtr<CSSValue> m_style;
-    RefPtr<CSSValue> m_weight;
-    RefPtr<CSSValue> m_stretch;
-    RefPtr<CSSValue> m_unicodeRange;
-    RefPtr<CSSValue> m_variant;
-    RefPtr<CSSValue> m_featureSettings;
+    RefPtrWillBeMember<CSSValue> m_src;
+    RefPtrWillBeMember<CSSValue> m_style;
+    RefPtrWillBeMember<CSSValue> m_weight;
+    RefPtrWillBeMember<CSSValue> m_stretch;
+    RefPtrWillBeMember<CSSValue> m_unicodeRange;
+    RefPtrWillBeMember<CSSValue> m_variant;
+    RefPtrWillBeMember<CSSValue> m_featureSettings;
     LoadStatus m_status;
 
     Vector<OwnPtr<FontFaceReadyPromiseResolver> > m_readyResolvers;
     OwnPtr<CSSFontFace> m_cssFontFace;
 };
 
 typedef Vector<RefPtr<FontFace> > FontFaceArray;
 
 } // namespace WebCore
 
 #endif // FontFace_h