ash: Fix abort-shutdown animation.

ash: Fix abort-shutdown animation.

This fixes a typo in SessionStateControllerImpl2 where the
wrong duration was being used for the
restore-brightness-and-grayscale animation displayed when
the user releases the power button before holding it long
enough to shut down (it was using 150 ms; this changes it to
500 ms).

It also corrects a similar typo in the undo-move-windows
animation (with no intended changes, though) and changes the
tween type for the abort-shutdown animation to make it less
flickery.

BUG=168793
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=175814

[sky, 2013-01-08 19:09:47]

LGTM

[commit-bot: I haz the power, 2013-01-08 19:14:41]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/derat@chromium.org/11783032/1

[commit-bot: I haz the power, 2013-01-08 19:17:45]

Step "update" is always a major failure.
Look at the try server FAQ for more details.

[commit-bot: I haz the power, 2013-01-08 20:17:37]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/derat@chromium.org/11783032/1

[commit-bot: I haz the power, 2013-01-09 01:38:39]

Retried try job too often on mac_rel for step(s) browser_tests

[commit-bot: I haz the power, 2013-01-09 14:47:59]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/derat@chromium.org/11783032/1

[commit-bot: I haz the power, 2013-01-09 16:48:37]

Change committed as 175814