This reverts commit c623495fd1ff90aada0eb625af91ec17843fefd0.
Reason for revert: Need to look into failure in remoting_unittests in Chrome (Webrtc/ConnectionTest.SecondCaptureFailed/0). It looks like the order FrameBuffer2 calls into VCMTiming while receiving frames and updating playout delay values, needs to be synchronized better.
Original change's description:
> Remove playout delay lock.
> Now update the playout delay and related stats on the worker thread.
>
> This was previously reviewed here:
> https://webrtc-review.googlesource.com/c/src/+/172929/
>
> With the exception of reducing unnecessarily broad
> lock scope in one function in rtp_rtcp_impl.cc
> and added comments in rtp_streams_synchronizer.h
>
> Bug: webrtc:11489
> Change-Id: I77807b5da2accfe774255d9409542d358f288993
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/174200
> Commit-Queue: Tommi <tommi@webrtc.org>
> Reviewed-by: Erik Språng <sprang@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#31193}
TBR=tommi@webrtc.org,sprang@webrtc.org
# Not skipping CQ checks because original CL landed > 1 day ago.
Bug: webrtc:11489
Change-Id: I9149025d2fc10686314e6d4e89d1b92125650c36
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/174757
Reviewed-by: Tommi <tommi@webrtc.org>
Commit-Queue: Tommi <tommi@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#31197}
6a871d3487