InlinedVisitor: Migrate html to use inlined tracing

Source/core/html/track/TrackEvent.cpp

 /*
  * Copyright (C) 2011 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 65 matching lines @@
         returnValue.setAudioTrack(toAudioTrack(m_track.get()));
         break;
     case TrackBase::VideoTrack:
         returnValue.setVideoTrack(toVideoTrack(m_track.get()));
         break;
     default:
         ASSERT_NOT_REACHED();
     }
 }
 
-void TrackEvent::trace(Visitor* visitor)
+DEFINE_TRACE(TrackEvent)
 {
     visitor->trace(m_track);
     Event::trace(visitor);
 }
 
 } // namespace blink