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This CL also fixes a minor bug the Cellular UI to show a disabled
'Connect' button if Cellular is not connectable (since it is never
configurable).

Bug: 853953
Change-Id: I218f34268b27a4a8fde10956a055d9235d329d77
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1769549
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#692082}