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Per https://w3c.github.io/webauthn/#dictdef-publickeycredentialcreationoptions

Change-Id: I78783bf1722d727e7014893e5f98e8e77c313b39
Reviewed-on: https://chromium-review.googlesource.com/933372Reviewed-by: Vadym Doroshenko <dvadym@chromium.org>
Commit-Queue: Kim Paulhamus <kpaulhamus@chromium.org>
Cr-Commit-Position: refs/heads/master@{#538823}