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Windows generally doesn't seem to echo the HmacSecret extension in their
response to AuthenticatorMakeCredential. However, AuthenticatorImpl already
parses the hmacSecret response value out of the authenticator data, so we
should not fail the request over this.

Bug: 898718
Change-Id: I1e732ab189f240df2be09ec89135af143634238f
Reviewed-on: https://chromium-review.googlesource.com/c/1357460
Commit-Queue: Martin Kreichgauer <martinkr@chromium.org>
Commit-Queue: Adam Langley <agl@chromium.org>
Reviewed-by: Adam Langley <agl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612798}