Move nat-related code to target rtc_base_tests_utils.

Move nat-related code to target rtc_base_tests_utils.

BUG=None

Review-Url: https://codereview.webrtc.org/2591733002
Cr-Commit-Position: refs/heads/master@{#15728}
Committed: https://chromium.googlesource.com/external/webrtc/+/01c715096f9e7aa3701ed3893e3527b587af0a89

[nisse-webrtc, 2016-12-20 13:15:16]

nisse@webrtc.org changed reviewers:
+ kjellander@webrtc.org

[nisse-webrtc, 2016-12-20 13:15:17]

As far as I understand, this NAT code is used only by tests.

[kjellander_webrtc, 2016-12-20 13:51:54]

lgtm assuming ours, Chromium's and the internal trybots are happy.

[nisse-webrtc, 2016-12-21 08:01:33]

The CQ bit was checked by nisse@webrtc.org

[commit-bot: I haz the power, 2016-12-21 08:01:40]

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

[commit-bot: I haz the power, 2016-12-21 08:23:09]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1482307293923840, "parent_rev":
"70e4053844d06377aaa2142a64b90037d74bbcf9", "commit_rev":
"01c715096f9e7aa3701ed3893e3527b587af0a89"}

[commit-bot: I haz the power, 2016-12-21 08:23:11]

Description was changed from

==========
Move nat-related code to target rtc_base_tests_utils.

BUG=None
==========

to

==========
Move nat-related code to target rtc_base_tests_utils.

BUG=None

Review-Url: https://codereview.webrtc.org/2591733002
Cr-Commit-Position: refs/heads/master@{#15728}
Committed:
https://chromium.googlesource.com/external/webrtc/+/01c715096f9e7aa3701ed3893...
==========

[commit-bot: I haz the power, 2016-12-21 08:23:12]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/external/webrtc/+/01c715096f9e7aa3701ed3893...