This reverts commit 360c7afc.

Reason for revert: TSAN https://ci.chromium.org/ui/p/v8/builders/ci/V8%20Linux64%20TSAN%20-%20stress-incremental-marking/3437/overview

Original change's description:
> [weakrefs] Clear unregister token-related fields when clearing weak cells
>
> Bug: chromium:1213770
> Change-Id: Ic063e79bfa8f3dabdd29d1cc9ed74c7af44d0c31
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2923294
> Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
> Commit-Queue: Shu-yu Guo <syg@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#74890}

Bug: chromium:1213770
Change-Id: I9655db1a20d983c187779199e9009f6aeb5b46df
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2930553
Auto-Submit: Shu-yu Guo <syg@chromium.org>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#74893}