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This migrates DomainReliabilityMonitor from NetworkChangeManager to
NetworkConnectionTracker, which works with the network service enabled.

Bug: 887027
Change-Id: Icc22466c2272bdc45978218d1443c77810e7f663
Reviewed-on: https://chromium-review.googlesource.com/1234855Reviewed-by: Matt Menke <mmenke@chromium.org>
Commit-Queue: Robbie McElrath <rmcelrath@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592946}