Tests that cues are properly removed from the active cue list when their track changes mode to disabled.

EVENT(canplaythrough)
** Set the mode of the text track to showing. **
** Seek to a time with a caption. **
EVENT(seeked)
** Set the mode of the text track to hidden, then showing again. **
** Set the mode of the text track to disabled. **

No crash. PASS.

END OF TEST

