This destructor is declared virtual, but the class is not subclassed
anywhere. The empty body can be replaced by a =default. But since the
destructor doesn't do anything interesting, we can remove it.

Bug: v8:10488
Change-Id: Ie9c5f2c2742f644a99d85111dec208b01ad13fba
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2219397
Commit-Queue: Frank Tang <ftang@chromium.org>
Reviewed-by: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68276}