Builders-map is finally no longer necessary.

R=smut
TBR=ehmaldonado

Bug: 570733
Change-Id: I05c3087c877fdccfd878bb9befff4fb77b92b26b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1779543
Commit-Queue: Andrii Shyshkalov <tandrii@google.com>
Reviewed-by: smut <smut@google.com>
Auto-Submit: Andrii Shyshkalov <tandrii@google.com>