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Currently ash and ui are bundled together by way of process groups. Process
groups make it hard to have an explicit construction ordering. For OopAsh we
need Ash to control creation of the UI Service. This patch removes
progress-groups and instead uses ServiceFactory.

Ash has two distinct ways to provide the 'Ash' service, which necessitates
the change in two places. WindowManagerService will go away soon, and we
will only have one way.

BUG=837686
TEST=covered by tests

Change-Id: Id871fe56331f99fcfb6225f4ebf59378a533600a
Reviewed-on: https://chromium-review.googlesource.com/1098233Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Ken Rockot <rockot@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567339}