This reverts commit 30c6bd45.

Reason for revert: Breaks 
https://ci.chromium.org/p/v8/builders/ci/V8%20Linux64%20GC%20Stress%20-%20custom%20snapshot/30797?
and
 https://ci.chromium.org/p/v8/builders/ci/V8%20Blink%20Linux/4190
and
https://test-results.appspot.com/data/layout_results/V8_Blink_Linux/4190/blink_web_tests%20%28retry%20shards%20with%20patch%29/layout-test-results/results.html


Original change's description:
> [weakrefs] Ship WeakRef and FinalizationRegistry.
> 
> I2S: https://groups.google.com/a/chromium.org/g/blink-dev/c/L04PqDk9eMU
> Bug: v8:8179
> Change-Id: I52aaa62cdab981b802fa4a986d60421ef6efcfbb
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2158371
> Commit-Queue: Shu-yu Guo <syg@chromium.org>
> Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
> Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#67295}

TBR=ulan@chromium.org,rmcilroy@chromium.org,syg@chromium.org

Change-Id: I22b7d91fcde9761c40d4ccaaccab24629cdb4249
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:8179
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2158924Reviewed-by: Francis McCabe <fgm@chromium.org>
Commit-Queue: Francis McCabe <fgm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67297}