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and use that to download auxiliary packages, removing the custom scripts
previously used to do that.

Bug: 884608
Change-Id: Iefcd2145898588a6dbdc14c21841201f9d17f8c0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1605911
Commit-Queue: Hans Wennborg <hans@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712644}