GitLab

We only support 21+, so we should build for it.

Bug: 1116198
Change-Id: I552a946b245de0f54485ea985e08b53b92186bb1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2367984Reviewed-by: Ben Mason <benmason@chromium.org>
Commit-Queue: Ben Mason <benmason@chromium.org>
Auto-Submit: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804976}