Also fix an oversight in my previous CL.

R=jarin@chromium.org

Bug: v8:7790
Change-Id: I61c783392b7b7b38ea28dc44dc1e932d15b55bc6
Reviewed-on: https://chromium-review.googlesource.com/1106170Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53862}