InlinedVisitor: Migrate css to use inlined tracing

Source/core/css/FontFaceSetLoadEvent.cpp

 /*
  * 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 40 matching lines @@
 
 FontFaceSetLoadEvent::~FontFaceSetLoadEvent()
 {
 }
 
 const AtomicString& FontFaceSetLoadEvent::interfaceName() const
 {
     return EventNames::FontFaceSetLoadEvent;
 }
 
-void FontFaceSetLoadEvent::trace(Visitor* visitor)
+DEFINE_TRACE(FontFaceSetLoadEvent)
 {
     visitor->trace(m_fontfaces);
     Event::trace(visitor);
 }
 
 } // namespace blink