The experiment has been would down, so these can be removed.
This effectively reverts these two commits:

https://chromium-review.googlesource.com/c/v8/v8/+/3271389
https://chromium-review.googlesource.com/c/v8/v8/+/3256006

chrome side here:
https://chromium-review.googlesource.com/c/chromium/src/+/3399313

BUG=chromium:1257321
TEST=none

Change-Id: I5e9e4e7f56a6f19159d1c8c20c5a1fe5ed2859fb
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3399226Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78685}