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This replaces the restricted_connectivity property to a more versitale
portal_state property and enum.

Bug: 1133376
Change-Id: I2229e2675b95ceea7184bdfd773b85be12e3217d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2490252
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Kartik Hegde <khegde@chromium.org>
Reviewed-by: Azeem Arshad <azeemarshad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821409}