All of chromium's test pools should have these packages automatically
added via task templates. So there's no need to add them ourselves
in this script.

Bug: chromium:812428
Change-Id: I283ad5963cdf237220545c5ed1f21892f6ade18e
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2241901
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Reviewed-by: Robbie Iannucci <iannucci@chromium.org>