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This CL migrates NetworkMetricsProvider from NetworkChangeNotifier to
NetworkConnectionTracker, which works with the network service enabled.

The "Initial upload" patch of this CL is the same as:
https://chromium-review.googlesource.com/c/chromium/src/+/1222918

Bug: 883121
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs;luci.chromium.try:linux_mojo
Change-Id: Ic6879e48b9515d2281dc9da7c9437bad4c044a99
Reviewed-on: https://chromium-review.googlesource.com/c/1274585Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Reviewed-by: Tao Bai <michaelbai@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Jun Cai <juncai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605566}