Revert of Oilpan: Trace CSSFontFaceSrcValue::m_svgFontFaceElement.

Source/core/css/CSSFontFaceSrcValue.h

 /*
  * Copyright (C) 2007, 2008 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 55 matching lines @@
 #endif
 
     String customCSSText() const;
 
     bool hasFailedOrCanceledSubresources() const;
 
     FontResource* fetch(Document*);
 
     bool equals(const CSSFontFaceSrcValue&) const;
 
-    void traceAfterDispatch(Visitor*);
+    void traceAfterDispatch(Visitor* visitor) { CSSValue::traceAfterDispatch(visitor); }
 
 private:
     CSSFontFaceSrcValue(const String& resource, bool local)
         : CSSValue(FontFaceSrcClass)
         , m_resource(resource)
         , m_isLocal(local)
 #if ENABLE(SVG_FONTS)
-        , m_svgFontFaceElement(nullptr)
+        , m_svgFontFaceElement(0)
 #endif
     {
     }
 
     void restoreCachedResourceIfNeeded(Document*);
     bool shouldSetCrossOriginAccessControl(const KURL& resource, SecurityOrigin*);
 
     String m_resource;
     String m_format;
     Referrer m_referrer;
     bool m_isLocal;
 
     ResourcePtr<FontResource> m_fetched;
 
 #if ENABLE(SVG_FONTS)
-    RawPtrWillBeMember<SVGFontFaceElement> m_svgFontFaceElement;
+    SVGFontFaceElement* m_svgFontFaceElement;
 #endif
 };
 
 DEFINE_CSS_VALUE_TYPE_CASTS(CSSFontFaceSrcValue, isFontFaceSrcValue());
 
 }
 
 #endif