Deprecate RtpTransceiver.setDirection()
Deprecate RtpTransceiver.setDirection()

This is part of the work to add a return value to the function.

Bug: chromium:980879
Change-Id: Ifa5e491a6b493a927da9783f23bf9f44be81aa8a
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/181863
Reviewed-by: Guido Urdaneta <b320b46c13883733ef16ffb1e2d57504fa255ae4@webrtc.org>
Commit-Queue: Harald Alvestrand <ce816cd73d80f958d82de1df356058c2d2bca378@webrtc.org>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#31950}

ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc