TrackEvent.track should be (VideoTrack or AudioTrack or TextTrack)?

Source/core/html/track/TrackEvent.h

Index: Source/core/html/track/TrackEvent.h
diff --git a/Source/core/html/track/TrackEvent.h b/Source/core/html/track/TrackEvent.h
index 84d39f9c62e86e861bdef8e98f48e00014fea3e7..ff59d7812ebceec3d6d5ff39550f5af0aba1299a 100644
--- a/Source/core/html/track/TrackEvent.h
+++ b/Source/core/html/track/TrackEvent.h
@@ -31,6 +31,8 @@
 
 namespace blink {
 
+class VideoTrackOrAudioTrackOrTextTrack;
+
 struct TrackEventInit : public EventInit {
     TrackEventInit();
 
@@ -54,7 +56,7 @@ public:
 
     virtual const AtomicString& interfaceName() const override;
 
-    TrackBase* track() const { return m_track.get(); }
+    void track(VideoTrackOrAudioTrackOrTextTrack&);
 
     virtual void trace(Visitor*) override;