The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/platform/dev-util/+/225e241431bfc30cbb5c57a7deac340cb4048091

commit 225e241431bfc30cbb5c57a7deac340cb4048091
Author: Alex Klein <saklein@chromium.org>
Date: Fri Aug 31 12:23:29 2018

cros_choose_profile: cleanup 'base' profile logic

Boards should all have a profile now, so the 'base'
profile fallback to the chromeos overlay should no
longer be necessary.

BUG= chromium:879231 
TEST=precq passes

Change-Id: If98b4d03b23d4bfa62d98fe319c9fc00fbc7d2e3
Reviewed-on: https://chromium-review.googlesource.com/1197164
Commit-Ready: Alex Klein <saklein@chromium.org>
Tested-by: Alex Klein <saklein@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>

[modify] https://crrev.com/225e241431bfc30cbb5c57a7deac340cb4048091/host/cros_choose_profile