Without the proper check V8 would not delegate to the embedder (Blink) for
processing wrappable objects.

Bug: chromium:946941
Change-Id: I5aa3ca85e5113ab8d28a61eca6a5e0593c62f6a1
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1547649
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Hannes Payer <hpayer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60545}