Remove WebInbandTextTrack::isDefault()

Remove WebInbandTextTrack::isDefault()

The spec only mentions the default attribute on track elements
(out-of-band text tracks), in-band tracks don't have this
concept.

Also, because InbandTextTrack doesn't actually implement
isDefault(), this is all dead code.

The Chromium implementation (WebInbandTextTrackImpl) always
returns false and can be removed after a Blink roll.

Also remove HTMLTrackElement::isDefault() and setIsDefault(),
which are dead code because [Reflect] is used in the IDL.

BUG=315270
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=161396

[adamk, 2013-11-05 22:18:20]

lgtm

Love these dead-code-cleanup patches!

[philipj_slow, 2013-11-05 22:26:33]

On 2013/11/05 22:18:20, adamk wrote:
> lgtm
> 
> Love these dead-code-cleanup patches!

Thanks! I opportunistically removed some dead code in HTMLTrackElement in a
second patch set.

[commit-bot: I haz the power, 2013-11-05 22:29:44]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/philipj@opera.com/60633004/40001

[abarth-chromium, 2013-11-05 22:39:25]

public <-- LGTM

[commit-bot: I haz the power, 2013-11-05 22:40:46]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/philipj@opera.com/60633004/40001

[commit-bot: I haz the power, 2013-11-05 23:47:34]

Change committed as 161396