Restore focus when infobar closes.

Restore focus when infobar closes.

This was already implemented for non-aura Win, this just makes it
work on Aura Win and Chrome OS too.

BUG=179892
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=233499

[Peter Kasting, 2013-11-04 22:52:24]

Rubber-stamp LGTM; if you need a more expert opinion on whether
Widget::IsActive() is correct, someone like Ben would know better.

[dmazzoni, 2013-11-04 22:57:33]

+ben (Ben, would you make sure this is reasonable?)

[Ben Goodger (Google), 2013-11-05 17:45:05]

lgtm

[commit-bot: I haz the power, 2013-11-05 17:51:33]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/dmazzoni@chromium.org/53503004/1

[commit-bot: I haz the power, 2013-11-05 18:26:27]

Step "update" is always a major failure.
Look at the try server FAQ for more details.
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_rel&...

[commit-bot: I haz the power, 2013-11-06 23:31:36]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/dmazzoni@chromium.org/53503004/1

[commit-bot: I haz the power, 2013-11-07 00:01:46]

Step "update" is always a major failure.
Look at the try server FAQ for more details.
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win_rel&nu...

[commit-bot: I haz the power, 2013-11-07 00:51:45]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/dmazzoni@chromium.org/53503004/1

[commit-bot: I haz the power, 2013-11-07 06:16:46]

Change committed as 233499