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In cl/339905938, the Nearby server started returning both reachable
and unreachable contacts in the ListContactPeople RPC response. The
ContactRecord proto message now has a field denoting the contact's
reachability.

In this CL, we filter out unreachable contacts, counting the number
of removed unreachable contacts. This count is communicated to
observers. It may be useful to inform the user in the contacts UI that
a certain number of contacts are not being shown because they are not
associated with a GAIA account, and that Nearby Share requires this
association. This information is already present in the Android Nearby
Share UI.

Note: This CL should not be submitted until cl/339905938 reaches prod;
otherwise, all contacts will be filtered out due to the default-false
|is_reachable| field. After cl/339905938 hits prod but before this CL
lands, unreachable contacts will not be filtered out.

Bug: 1143837
Change-Id: I439469e02e9694e5853c807928dd687eaf7f3f69
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2514176Reviewed-by: James Vecore <vecore@google.com>
Reviewed-by: Alex Gough <ajgo@chromium.org>
Commit-Queue: Josh Nohle <nohle@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823749}