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This change updates a couple interested callers,
NearbyConnectionsManager and NetworkPredictionOptions, to use the new
NetworkChangeNotifier::GetConnectionCost() functionality. While this
change is functionally a no-op on non-Windows devices
(NearbyConnectionsManager is ChromeOS only), it provides a good example
for future callers to use the more appropriate method for the
functionality. In addition, if and when the concept of metered networks
becomes more flushed out for each platform these features will
automatically pick up the correct functionality.

Bug: 1143428
Change-Id: I9fac5f0a738a6abe70b9a7985aff854e52248ff2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2638111Reviewed-by: Filip Gorski <fgorski@chromium.org>
Reviewed-by: David Schinazi <dschinazi@chromium.org>
Commit-Queue: Cliff Smolinsky <cliffsmo@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#845239}