GitLab

This change aligns Chromium with the current state of the spec[1]: the
“appid” extension output will only be returned when the caller requested
the appid extension, and it'll be true iff the AppID value was actually
used when getting the assertion.

[1] https://w3c.github.io/webauthn/#sctn-appid-extension

BUG=853770

Change-Id: I6ac9470c71bfc0cc3b38f6e91c5e8f00b0586405
Reviewed-on: https://chromium-review.googlesource.com/1162823Reviewed-by: Balazs Engedy <engedy@chromium.org>
Reviewed-by: Jun Choi <hongjunchoi@chromium.org>
Reviewed-by: Greg Kerr <kerrnel@chromium.org>
Commit-Queue: Adam Langley <agl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582231}