Use CrNetworkListenerBehavior in cr-network-select

This also uses the network_config mojo API to call requestNetworkScan.

Bug: 853953
Change-Id: Icdbcad9669ff253e2eb8c78873d7b847740d1462
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1665653
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#670660}
5 files changed