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This splits cros_network_config mojo interface into a shared group of
enums that are reused in Network Health's interface.

Bug: chromium:1057739
Change-Id: I5bc2673f0c856dbbcb689a96282982e795562271
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2157769Reviewed-by: Nasko Oskov <nasko@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Trent Begin <tbegin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#763357}