Make Widget::Show() creates active windows.

Make Widget::Show() creates active windows.

It is actually what this is doing in practice but only because
SHOW_STATE_INACTIVE implementation is broken and usually creates active
windows.

BUG=None

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=243590

[mlamouri (slow - plz ping), 2013-12-20 14:48:52]

This patch is applying what sky asked for in cl 109473003 with regard to
Widget::Show() activation behaviour.

The review is addressed to ben@ and sky@ because sky@ seems to be away for the
next 2 weeks.

[sky, 2014-01-06 17:32:18]

LGTM

[commit-bot: I haz the power, 2014-01-06 19:22:51]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/mlamouri@chromium.org/118283003/1

[commit-bot: I haz the power, 2014-01-06 22:09:08]

Retried try job too often on win_rel for step(s) interactive_ui_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win_rel&nu...

[mlamouri (slow - plz ping), 2014-01-08 14:21:44]

sky@, could you PTAL at this. I have changed some Widget::Show() calls to
Widget::ShowInactive() in order to pass tests on Windows. Tests are passing on
Windows now and the failure I see on other platforms do not seem related to
those changes.

[sky, 2014-01-08 15:18:59]

SLGTM

[commit-bot: I haz the power, 2014-01-08 15:58:02]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/mlamouri@chromium.org/118283003/360001

[commit-bot: I haz the power, 2014-01-08 17:28:28]

Change committed as 243590