message: Moved AsyncInvoker to be destructed first in WebRtcVideoSendStream.
  Cr-Commit-Position: refs/heads/master@{#28283}
diff: @@ -349,7 +349,6 @@ class WebRtcVideoChannel : public VideoMediaChannel, public webrtc::Transport {
  RTC_EXCLUSIVE_LOCKS_REQUIRED(&thread_checker_);
  rtc::ThreadChecker thread_checker_;
  - rtc::AsyncInvoker invoker_;
  rtc::Thread* worker_thread_;
  const std::vector<uint32_t> ssrcs_ RTC_GUARDED_BY(&thread_checker_);
  const std::vector<SsrcGroup> ssrc_groups_ RTC_GUARDED_BY(&thread_checker_);
  @@ -373,6 +372,11 @@ class WebRtcVideoChannel : public VideoMediaChannel, public webrtc::Transport {
  webrtc::RtpParameters rtp_parameters_ RTC_GUARDED_BY(&thread_checker_);
  bool sending_ RTC_GUARDED_BY(&thread_checker_);
  +
  + // In order for the |invoker_| to protect other members from being
  + // destructed as they are used in asynchronous tasks it has to be destructed
  + // first.
  + rtc::AsyncInvoker invoker_;
  };
  // Wrapper for the receiver part, contains configs etc. that are needed to
  