Fixup after https://chromium-review.googlesource.com/716480

Bug: v8:6600
Change-Id: I0e1b494c6263f21f772ce55d8fc723a66b41b07c
Reviewed-on: https://chromium-review.googlesource.com/734041Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Mostyn Bramley-Moore <mostynb@vewd.com>
Cr-Commit-Position: refs/heads/master@{#48872}