message: Log VideoSendStreamImpl::Stop in logs
  Removes confusion in the logs because both VideoSendStream and
  VideoSendStreamImpl use the same log line.
  Cr-Commit-Position: refs/heads/master@{#32693}
diff: @@ -403,7 +403,7 @@ void VideoSendStreamImpl::StartupVideoSendStream() {
  void VideoSendStreamImpl::Stop() {
  RTC_DCHECK_RUN_ON(worker_queue_);
  - RTC_LOG(LS_INFO) << "VideoSendStream::Stop";
  + RTC_LOG(LS_INFO) << "VideoSendStreamImpl::Stop";
  if (!rtp_video_sender_->IsActive())
  return;
  TRACE_EVENT_INSTANT0("webrtc", "VideoSendStream::Stop");
  