This interface/config field is now unused, let's remove it. Bug: webrtc:10633 Change-Id: I56ff3d47ba784d973de411ada52ec9485bad9864 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/150531 Reviewed-by: Stefan Holmer <stefan@webrtc.org> Commit-Queue: Erik Språng <sprang@webrtc.org> Cr-Commit-Position: refs/heads/master@{#28978}