This makes the WebRTC-KeepAbsSendTimeExtension field trial always enabled. This means that we no longer avoid sending the abs-send-time extension if we have negotiated sending of transport wide sequence numbers. The field trial WebRTC-FilterAbsSendTimeExtension is introduced to allow reverting to the previous behavior. Bug: webrtc:10234 Change-Id: Ifd9761d84dd1fe79af840f98ad0882a2e5adf0b0 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/159181 Commit-Queue: Sebastian Jansson <srte@webrtc.org> Reviewed-by: Per Kjellander <perkj@webrtc.org> Reviewed-by: Konrad Hofbauer <hofbauer@webrtc.org> Cr-Commit-Position: refs/heads/master@{#29999}