Fix compile error from ambiguous call to std::abs

Fix compile error from ambiguous call to std::abs

Force using the int std::abs(int) version.

BUG=webrtc:7807

[lliuu, 2017-06-13 18:58:17]

The CQ bit was checked by lliuu@webrtc.org to run a CQ dry run

[commit-bot: I haz the power, 2017-06-13 18:58:28]

Dry run: CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.webrtc.org/...

[lliuu, 2017-06-13 18:59:20]

Description was changed from

==========
Fix compile error from ambiguous call to std::abs

Force using the int std::abs(int) version.

BUG=webrtc:7807
==========

to

==========
Fix compile error from ambiguous call to std::abs

Force using the int std::abs(int) version.

BUG=webrtc:7807
==========

[lliuu, 2017-06-13 18:59:20]

lliuu@webrtc.org changed reviewers:
+ niklas.enbom@webrtc.org

[commit-bot: I haz the power, 2017-06-13 19:17:20]

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

[commit-bot: I haz the power, 2017-06-13 19:17:21]

Dry run: This issue passed the CQ dry run.

[henrika_webrtc, 2017-06-14 07:04:13]

I don't think we need this. See comments in webrtc:7807.