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This wires the IsUserVerifyingPlatformAuthenticator API call up to its
implementation in the native Windows API, where available.

Bug: 898718
Change-Id: I40307ff39f8dc8e02197debc48041aad62d253ac
Reviewed-on: https://chromium-review.googlesource.com/c/1351900
Commit-Queue: Adam Langley <agl@chromium.org>
Reviewed-by: Adam Langley <agl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611948}