Migrate chrome/browser/chromeos/policy to NetworkConnectionTracker

This migrates AutoEnrollmentClientImpl and AppInstallEventLoCollector
from using net::NetworkChangeNotifier to
content::NetworkConnectionTracker, which works with the network service
enabled.

Bug: 821009
Change-Id: I33dbd4ab0102d5a55bf34affdb7366b444e842ac
Reviewed-on: https://chromium-review.googlesource.com/1147602
Commit-Queue: Robbie McElrath <rmcelrath@chromium.org>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579187}
6 files changed