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Add a method to the certificate manager that returns all of the local
device private certificates of a given visibility, converted to public
certificates.

This feature was requested in crrev/c/2346325.

Bug: 1114765
Change-Id: Ifec56ec08a6072018f35e5e0121ecf9562201faf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2348295
Commit-Queue: Josh Nohle <nohle@chromium.org>
Reviewed-by: Himanshu Jaju <himanshujaju@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798246}