This reverts commit 4dac9872.

Reason for revert: Speculative revert for layout test failures:
https://ci.chromium.org/p/v8/builders/luci.v8.ci/V8-Blink%20Linux%2064/25970

E.g.:
virtual/service-worker-servicification/http/tests/serviceworker/webexposed/global-interface-listing-service-worker.html

Original change's description:
> Ship globalThis 🎉
> 
> Proposal repository:
> https://github.com/tc39/proposal-global
> 
> Intent to ship:
> https://groups.google.com/d/msg/v8-users/Vkoh0wXRwaM/Yt7MpzhkAgAJ
> 
> Bug: v8:5537
> Change-Id: I60a6c5375165d89548db12fef454a64137d04c27
> Reviewed-on: https://chromium-review.googlesource.com/1195494
> Reviewed-by: Adam Klein <adamk@chromium.org>
> Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
> Commit-Queue: Mathias Bynens <mathias@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#55543}

TBR=adamk@chromium.org,gsathya@chromium.org,mathias@chromium.org

Change-Id: Iacb484d36ba2c8002336038660450b240006e0ab
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:5537
Reviewed-on: https://chromium-review.googlesource.com/1199743Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55564}