This reverts commit 52fd96fb731d9a911bd064a9718d96fef0bd5b24. Reason for revert: previously undetected lock recursions happening in downstream project. Original change's description: > Migrate test/time_controller to webrtc::Mutex. > > Bug: webrtc:11567 > Change-Id: I26fb07bf84ed197ce667290aa0bf4816bc9c5c06 > Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/178818 > Reviewed-by: Sebastian Jansson <srte@webrtc.org> > Commit-Queue: Markus Handell <handellm@webrtc.org> > Cr-Commit-Position: refs/heads/master@{#31660} TBR=srte@webrtc.org,handellm@webrtc.org Change-Id: Icccfa32ac21412bc46f75ac7aca76641f5593096 No-Presubmit: true No-Tree-Checks: true No-Try: true Bug: webrtc:11567 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/178872 Reviewed-by: Markus Handell <handellm@webrtc.org> Commit-Queue: Markus Handell <handellm@webrtc.org> Cr-Commit-Position: refs/heads/master@{#31668}