This is the last method which modified the Result after construction.
Turn this into a named constructor instead.

Drive-by: Replace a Result<bool> by VoidResult, since the bool is not
used anywhere.

R=mstarzinger@chromium.org

Bug: v8:8238
Change-Id: I352e0687e99a90e6ad00587d6fdf388f68c9b60a
Reviewed-on: https://chromium-review.googlesource.com/c/1296271
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56897}