Chrome OS: move DiscoverManager ownership to ChromeBrowserMainPartsChromeos.

TBR=sky@chromium.org

Bug: 828999
Change-Id: I46514f21581ab6d30e1c4b38719b66e43b075f42
Reviewed-on: https://chromium-review.googlesource.com/c/1278129
Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Reviewed-by: Jacob Dufault <jdufault@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Alexander Alekseev <alemate@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599146}
5 files changed