luci-config has been switched to read from https://chromium.googlesource.com/external/webrtc/+/infra/config R=machenbach@chromium.org, phajdan.jr@chromium.org, kjellander@chromium.org NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true BUG=513460 Review URL: https://codereview.webrtc.org/1255883005 Cr-Commit-Position: refs/heads/master@{#9689}