This reverts commit a7eff8cb.

Reason for revert: adds tests which fail:
https://ci.chromium.org/p/v8/builders/ci/V8%20Linux64%20TSAN%20-%20concurrent%20marking/14266

Original change's description:
> [inspector] Ensure progress of default task runners in inspector tests
> 
> Bug: v8:10747, chromium:1098187
> Change-Id: I0215d2d85db4dd1d7fa376a0982cda5658f1683d
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2315982
> Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
> Reviewed-by: Peter Marshall <petermarshall@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#69387}

TBR=ulan@chromium.org,petermarshall@chromium.org

Change-Id: I2088dc8c13416c882212316c0b7137ea28beb563
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:10747
Bug: chromium:1098187
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2354421Reviewed-by: Bill Budge <bbudge@chromium.org>
Commit-Queue: Bill Budge <bbudge@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69390}