InlinedVisitor: Migrate html to use inlined tracing

Source/core/html/track/LoadableTextTrack.cpp

 /*
  * Copyright (C) 2011 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:
  * 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 160 matching lines @@
             continue;
         if (track == m_trackElement)
             return index;
         ++index;
     }
     ASSERT_NOT_REACHED();
 
     return 0;
 }
 
-void LoadableTextTrack::trace(Visitor* visitor)
+DEFINE_TRACE(LoadableTextTrack)
 {
     visitor->trace(m_trackElement);
     visitor->trace(m_loader);
     TextTrack::trace(visitor);
 }
 
 } // namespace blink