GitLab

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

Just cleanup, no functional changes.

Bug: 873267
Test: ash_unittests
Change-Id: I8d4243ad50d66ac7982dbe12132a736903271f63
Reviewed-on: https://chromium-review.googlesource.com/1171807Reviewed-by: Jun Mukai <mukai@chromium.org>
Commit-Queue: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582498}