Deprecate ApMode histograms

We're dropping ad-hoc support in Chrome OS, so this metric will become a
singleton (just "managed"). Shill will stop reporting it at all, so mark
it as obsolete here.

Bug: chromium:931442
Change-Id: Ief45e3edfe1104c33f09ff0773ae3fe19c8b2a56
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1625742
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Brian Norris <briannorris@chromium.org>
Cr-Commit-Position: refs/heads/master@{#663345}
1 file changed