Re-apply change https://codereview.webrtc.org/1426673007/

Re-apply change https://codereview.webrtc.org/1426673007/

Do not delete the turn port entry right away when the respective
connection is deleted. The dependency on asyncinvoker has been added
in chromium libjingle-nacl.

BUG=webrtc:5120
Committed: https://crrev.com/32f39968ce79cfca5146069e410ded2f104bba23
Cr-Commit-Position: refs/heads/master@{#10679}

[honghaiz3, 2015-11-17 01:20:07]

honghaiz@webrtc.org changed reviewers:
+ pthatcher@webrtc.org

[pthatcher1, 2015-11-17 19:22:32]

lgtm

[honghaiz3, 2015-11-17 19:35:12]

The CQ bit was checked by honghaiz@webrtc.org

[commit-bot: I haz the power, 2015-11-17 19:35:26]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1450263002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1450263002/1

[commit-bot: I haz the power, 2015-11-17 19:36:35]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-17 19:36:42]

Patchset 1 (id:??) landed as
https://crrev.com/32f39968ce79cfca5146069e410ded2f104bba23
Cr-Commit-Position: refs/heads/master@{#10679}