Ignore MediaController in the closed captions button logic

Ignore MediaController in the closed captions button logic

Involving the media controller plainly does not make sense.

There was no test coverage for the CC button with a media controller
present, and adding a negative test for it does not seem useful.

Note that what remains is still not great since it doesn't allow you to
pick between multiple tracks, but that will be fixed at a later time.

BUG=341813
TEST=LayoutTests/media/audio-controls-captions.html
     LayoutTests/media/video-controls-captions.html

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=169405

[acolwell GONE FROM CHROMIUM, 2014-03-18 00:10:23]

lgtm

[philipj_slow, 2014-03-18 02:05:45]

The CQ bit was checked by philipj@opera.com

[commit-bot: I haz the power, 2014-03-18 03:19:09]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/philipj@opera.com/201123004/1

[commit-bot: I haz the power, 2014-03-18 03:30:50]

Change committed as 169405