message: Deprecate RtpTransceiver.setDirection()
  This is part of the work to add a return value to the function.
  Cr-Commit-Position: refs/heads/master@{#31950}
diff: @@ -111,7 +111,8 @@ class RTC_EXPORT RtpTransceiverInterface : public rtc::RefCountInterface {
  // https://w3c.github.io/webrtc-pc/#dom-rtcrtptransceiver-direction
  // TODO(hta): Deprecate SetDirection without error and rename
  // SetDirectionWithError to SetDirection, remove default implementations.
  - virtual void SetDirection(RtpTransceiverDirection new_direction);
  + RTC_DEPRECATED virtual void SetDirection(
  + RtpTransceiverDirection new_direction);
  virtual RTCError SetDirectionWithError(RtpTransceiverDirection new_direction);
  // The current_direction attribute indicates the current direction negotiated
  