The SetSSRC() method is slated for removal, make sure we set the local SSRC at construction time. Bug: webrtc:10774 Change-Id: I431e828caf60c5e0134adbe82d1d3345745cc6ae Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/149827 Commit-Queue: Erik Språng <sprang@webrtc.org> Reviewed-by: Fredrik Solenberg <solenberg@webrtc.org> Cr-Commit-Position: refs/heads/master@{#28926}