Remove html.elements.track.cuechange_event (#5244)
Remove html.elements.track.cuechange_event (#5244)

This data is stored as `api.HTMLTrackElement.cuechange_event`
mdn/browser-compat-data,chrisdavidmills/browser-compat-data,mdn/browser-compat-data,chrisdavidmills/browser-compat-data