GitLab

Also mark other histograms in installer as obsolete as they have been
replaced by UpdateEngine onces long time ago.

BUG=None
TEST=None

Change-Id: Id5698e75d9f152f142f131b53ccaadc45ee899a8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2472595
Auto-Submit: Amin Hassani <ahassani@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Amin Hassani <ahassani@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817557}