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

Bug: 868011
Change-Id: I98d8644c128174b7b887c76dc40ad2725f052182
Reviewed-on: https://chromium-review.googlesource.com/1161200Reviewed-by: Min Qin <qinmin@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Commit-Queue: Robbie McElrath <rmcelrath@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583835}