After https://crrev.com/c/995533, the tests should be stable again.

R=ahaas@chromium.org

Bug: v8:7621
Change-Id: Ib7a6a6503cb5398c179937a68daace09f43b9b3a
Reviewed-on: https://chromium-review.googlesource.com/995443
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52375}