This reverts commit 475006d4a30f8bc47f82eb540a6a066da2829095. Reason for revert: Speculative revert. Breaks downstream project Original change's description: > Revert back to using the task_queue_ for guarding access. > > This removes the SequenceChecker that was temporarily used while > the rtc::Thread TQ implementation was being fixed. > > Bug: none > Change-Id: Iaa46e47371211ac0a97b2dcaf23cef12b43ee8ea > Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/175081 > Commit-Queue: Tommi <tommi@webrtc.org> > Reviewed-by: Sebastian Jansson <srte@webrtc.org> > Cr-Commit-Position: refs/heads/master@{#31256} TBR=tommi@webrtc.org,srte@webrtc.org Change-Id: I17a12bdca888a63f2fd161da30c0def5b9c3d04e No-Presubmit: true No-Tree-Checks: true No-Try: true Bug: none Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/175103 Reviewed-by: Artem Titov <titovartem@webrtc.org> Commit-Queue: Artem Titov <titovartem@webrtc.org> Cr-Commit-Position: refs/heads/master@{#31258}