Apply toFoo generation macro to TrackBase classes

Source/core/html/track/TrackBase.h

 /*
  * 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 60 matching lines @@
 private:
     blink::WebMediaPlayer::TrackId m_trackId;
     Type m_type;
     AtomicString m_kind;
     AtomicString m_label;
     AtomicString m_language;
     String m_id;
     RawPtrWillBeMember<HTMLMediaElement> m_mediaElement;
 };
 
+#define DEFINE_TRACK_TYPE_CASTS(thisType, predicate) \
+    DEFINE_TYPE_CASTS(thisType, TrackBase, track, track->type() == predicate, track.type() == predicate)
+
 } // namespace WebCore
 
 #endif // TrackBase_h