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This aligns it with e.g. PublicKeyCredentialUserEntity.

Change-Id: I907d97d03e529eb44fcc14e9cf5ce0cd9ab77f27
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1610656Reviewed-by: Nina Satragno <nsatragno@chromium.org>
Reviewed-by: Chris Palmer <palmer@chromium.org>
Commit-Queue: Martin Kreichgauer <martinkr@google.com>
Cr-Commit-Position: refs/heads/master@{#661129}