AFAICT this doesn't currently change observable behavior, but should
be fixed nonetheless.

Change-Id: I1dce90ae5bcad39d7d54dddd2559bd7f7ccbb095
Reviewed-on: https://chromium-review.googlesource.com/648354Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Ben Titzer <titzer@chromium.org>
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47835}