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This CL eliminates:
* disable-network-settings-config
* networkSettingsConfig
* NetworkConfigView and related unused classes

This also cleans up some stale comments and related interfaces.

Bug: 848090
Cq-Include-Trybots: luci.chromium.try:closure_compilation
Change-Id: Id79b835f72b79694d7013cf19a17d553622f844b
Reviewed-on: https://chromium-review.googlesource.com/1102912
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Toni Barzic <tbarzic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568327}