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Ensure that the local device has 3 valid private certificates for each
visibility mode. Perform this check when the expiration scheduler
informs the certificate manager that a private certificate has expired.
When private certificates change, notify observers and upload the local
device certificates (converted to public certificates) to the Nearby
Share server.

Bug: b/166112705
Change-Id: I367ed1df0ca3b4c5eb044795539f05ba24b5311f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2377506
Commit-Queue: Josh Nohle <nohle@chromium.org>
Reviewed-by: James Vecore <vecore@google.com>
Cr-Commit-Position: refs/heads/master@{#802487}