Instead run them synchronously.

Bug: chromium:890631
Change-Id: I3af68e335551d3754267ec0f51b895785ab7cd89
Reviewed-on: https://chromium-review.googlesource.com/1256925Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56341}