The header extensions for a receive stream should also be used for the associated RTX stream, but not for the (RTCP) send stream. Bug: webrtc:10113 Change-Id: Ibeb25a4490d7f628f1b360bf4d6f7edf444ba22a Reviewed-on: https://webrtc-review.googlesource.com/c/113807 Reviewed-by: Erik Språng <sprang@webrtc.org> Commit-Queue: Björn Terelius <terelius@webrtc.org> Cr-Commit-Position: refs/heads/master@{#25955}