Fixed mistake in logical check for rollback.

Fixed mistake in logical check for rollback.

BUG=379002
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=273771

[Vitaly Buka (NO REVIEWS), 2014-05-30 00:08:51]

Hi Greg, I'll submit this trivial fix as TBR to get sooner into Canary.

The code was implemented this way in patch
https://codereview.chromium.org/149023010, but I managed somehow switch
operator, playing with that code.

[Vitaly Buka (NO REVIEWS), 2014-05-30 00:08:57]

The CQ bit was checked by vitalybuka@chromium.org

[commit-bot: I haz the power, 2014-05-30 00:11:22]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/vitalybuka@chromium.org/307943008/20001

[grt (UTC plus 2), 2014-05-30 02:58:44]

lgtm

[Vitaly Buka (NO REVIEWS), 2014-05-30 07:49:00]

The CQ bit was unchecked by vitalybuka@chromium.org

[Vitaly Buka (NO REVIEWS), 2014-05-30 07:49:10]

The CQ bit was checked by vitalybuka@chromium.org

[commit-bot: I haz the power, 2014-05-30 07:50:19]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/vitalybuka@chromium.org/307943008/20001

[commit-bot: I haz the power, 2014-05-30 08:25:33]

Change committed as 273771