Converts last remaining Node*.

Bug: v8:6949
Change-Id: I792a7efa3dc3cdfd0e0ae8349aad6da54f4e8db8
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1871928
Auto-Submit: Dan Elphick <delphick@chromium.org>
Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
Reviewed-by: Santiago Aboy Solanes <solanes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64431}