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It is possible to create a credential on an authenticator that supports
user verification but doesn't have it configured.

If the user then tries to authenticate using that credential, and the
relying party sets UV=required, the message returned says that no
credential exists. This could be confusing for developers trying to
debug problems.

This patch changes the error to indicate that UV is not available.

Fixed: 1029285
Change-Id: Id70960d0a3830854decfa9d02464cd51c1c8f52a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1943386
Commit-Queue: Ken Buchanan <kenrb@chromium.org>
Reviewed-by: Martin Kreichgauer <martinkr@google.com>
Reviewed-by: Adam Langley <agl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720624}