Create audio stream instead of data channel to check compatibility of network layer with PeerConnection. Replacement is done because there is a data race inside data channel sctp transport. This CL will fix bot behavior. Further data race investigation will be done in this bug: https://bugs.chromium.org/p/webrtc/issues/detail?id=10268 Bug: webrtc:10268, webrtc:10138 Change-Id: I4f7a1116c65dbf4a3508b7d81d654ccd320795f0 Reviewed-on: https://webrtc-review.googlesource.com/c/120807 Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org> Reviewed-by: Sebastian Jansson <srte@webrtc.org> Commit-Queue: Artem Titov <titovartem@webrtc.org> Cr-Commit-Position: refs/heads/master@{#26495}