Ensure that a TextTrackCue won't be collected if it has a custom property.

** Validate.
EXPECTED (video.textTracks[0].cues.length == '4') OK
EXPECTED (video.textTracks[0].cues[1].startTime == '31') OK

** Add a custom property to a cue.
RUN(video.textTracks[0].cues[1].myProperty = 'tuna salad?')
EXPECTED (video.textTracks[0].cues[1].myProperty == 'tuna salad?') OK

** Force garbage collection.
EXPECTED (video.textTracks[0].cues.length == '4') OK
EXPECTED (video.textTracks[0].cues[1].myProperty == 'tuna salad?') OK

END OF TEST

