deps: backport de1461b7efd from upstream v8

Original commit message:

    Drop UniqueId from include/v8.h

    It's unused since March 2 2017 (https://chromium-review.googlesource.com/448539).
    This removes it assuming that leaving it in the header was an oversight.

    BUG=v8:5828

    Review-Url: https://codereview.chromium.org/2732803002
    Cr-Commit-Position: refs/heads/master@{#43605}

Ref: https://github.com/v8/v8/commit/de1461b7efd

PR-URL: https://github.com/nodejs/node/pull/12875


Reviewed-By: James M Snell <jasnell@gmail.com>