Oilpan: Remove Element* raw pointers in objects

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 79 matching lines @@
     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)
+    // FIXME: Oilpan: Changing this to a member leaks Document.
+    // Figure out the retaining path. See https://codereview.chromium.org/337703004
     SVGFontFaceElement* m_svgFontFaceElement;
 #endif
 };
 
 DEFINE_CSS_VALUE_TYPE_CASTS(CSSFontFaceSrcValue, isFontFaceSrcValue());
 
 }
 
 #endif