GitLab

It is flaky:
https://ci.chromium.org/p/chrome/builders/ci/linux-chromeos-chrome

We should use async semantics rather than wait runloop at GetPlugins().

TBR=sky@chromium.org
BUG=1147726

Change-Id: I003bee856004e0f7476cf008429d68284776173f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2531418Reviewed-by: Yoichi Osato <yoichio@chromium.org>
Commit-Queue: Yoichi Osato <yoichio@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826145}