GitLab

In chromeos-specific code that bans ash via !ash, make sure there is
a comment explaining why and a +ash/public.

Bug: none
Change-Id: I5ab13065090aead649fff6e54ebde95b30053d01
Reviewed-on: https://chromium-review.googlesource.com/965027Reviewed-by: Michael Wasserman <msw@chromium.org>
Commit-Queue: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543587}