INPUT element: Fix integer overflow in input.stepDown().

INPUT element: Fix integer overflow in input.stepDown().

-n doesn't work for n=-2147483648.

BUG=658717
Committed: https://crrev.com/28c02d6167e1c545716f433dc84e3656da28c816
Cr-Commit-Position: refs/heads/master@{#427681}

[tkent, 2016-10-26 03:27:37]

The CQ bit was checked by tkent@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-10-26 03:28:08]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-10-26 04:21:46]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-10-26 04:21:46]

Dry run: Try jobs failed on following builders:
  linux_chromium_clobber_rel_ng on master.tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[tkent, 2016-10-26 04:26:39]

tkent@chromium.org changed reviewers:
+ keishi@chromium.org

[tkent, 2016-10-26 04:26:39]

Keishi, would you review this please?

[keishi, 2016-10-26 11:27:59]

LGTM

[tkent, 2016-10-26 13:23:54]

The CQ bit was checked by tkent@chromium.org

[commit-bot: I haz the power, 2016-10-26 13:24:07]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-10-26 14:06:11]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-10-26 14:08:38]

Description was changed from

==========
INPUT element: Fix integer overflow in input.stepDown().

-n doesn't work for n=-2147483648.

BUG=658717
==========

to

==========
INPUT element: Fix integer overflow in input.stepDown().

-n doesn't work for n=-2147483648.

BUG=658717

Committed: https://crrev.com/28c02d6167e1c545716f433dc84e3656da28c816
Cr-Commit-Position: refs/heads/master@{#427681}
==========

[commit-bot: I haz the power, 2016-10-26 14:08:39]

Patchset 1 (id:??) landed as
https://crrev.com/28c02d6167e1c545716f433dc84e3656da28c816
Cr-Commit-Position: refs/heads/master@{#427681}