Its contents are now inlined into the one remaining call site.

Bug: v8:6666
Change-Id: Icfcf89013506fec880ffd84eaa88b91e818e28c0
Reviewed-on: https://chromium-review.googlesource.com/1073311Reviewed-by: Igor Sheludko <ishell@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53363}