luci-config has been switched to read from
https://chromium.googlesource.com/v8/v8/+/infra/config

R=machenbach@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=513460

Review URL: https://codereview.chromium.org/1258763004

Cr-Commit-Position: refs/heads/master@{#29897}