Only use, in VCMTiming, protects it with its own mutex. Bug: webrtc:12102 Change-Id: I9c09976f9d938565b3e2908eca6cfee0c4063f6f Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/190721 Reviewed-by: Philip Eliasson <philipel@webrtc.org> Reviewed-by: Tommi <tommi@webrtc.org> Commit-Queue: Niels Moller <nisse@webrtc.org> Cr-Commit-Position: refs/heads/master@{#32529}