This simplifies a bit.

R=jgruber@chromium.org

Change-Id: If7a433c9d2b13edf4fe4485816ac5ab06435773e
Reviewed-on: https://chromium-review.googlesource.com/1172299Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55084}