Do not time out a port if its role switched from controlled to controlling. Also fix some comments.
BUG=webrtc:5026

Review URL: https://codereview.webrtc.org/1376983002

Cr-Original-Commit-Position: refs/heads/master@{#10122}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: d0b3143f0e37f5f5e0578e88cf740dd839b50c24
3 files changed