This will allow the blink-layer ICE-transport handling code to use the virtual interface class rather than the concrete implementation class. Bug: chromium:864871 Change-Id: I5dfd1f266b3f3eabe42e09ba35afe218d25634b1 Reviewed-on: https://webrtc-review.googlesource.com/c/118360 Commit-Queue: Harald Alvestrand <hta@webrtc.org> Reviewed-by: Steve Anton <steveanton@webrtc.org> Cr-Commit-Position: refs/heads/master@{#26333}