GitLab

There's no separate "classic" mode in ash anymore. Collapse the
superclass with its only subclass.

Just cleanup, no functional changes.

Bug: 873266
Test: ash_unittests
Change-Id: I70cdf56a8cb534cc5f5f1385ef5d702d3694b5a5
Reviewed-on: https://chromium-review.googlesource.com/1171821Reviewed-by: Jun Mukai <mukai@chromium.org>
Commit-Queue: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582499}