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The spec says the protocol identifier is the string "ctap1/u2f" [1], but
the devtools protocol definition does not support slashes on enums.

[1] https://w3c.github.io/webauthn/#authenticator-configuration

Bug: 922572
Change-Id: Ide12cac53eadbac4260924c86bf0ad1d612b4c1e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1842172
Auto-Submit: Nina Satragno <nsatragno@chromium.org>
Commit-Queue: John Chen <johnchen@chromium.org>
Reviewed-by: John Chen <johnchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702990}