Migrate data_reduction_proxy classes to NetworkConnectionTracker.

This migrates all NetworkChangeNotifier usages in
components/data_reduction_proxy/core/browser to the new
NetworkConnectionTracker, which will work with the network service
enabled.

Bug: 868005
Change-Id: Ia81ebef073b72f9baa3e97550451ad92c4aac2aa
Reviewed-on: https://chromium-review.googlesource.com/1157345
Commit-Queue: Robbie McElrath <rmcelrath@chromium.org>
Reviewed-by: Doug Arnett <dougarnett@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583811}
22 files changed