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There are versions of webauthn.dll that ship without BLE support. On
platforms where that is the case, direct access to FIDO token is not
blocked by the OS and so we don't want to integrate with webauthn.dll
there. This changes WinWebAuthnApi to call WebAuthNGetApiVersion on
initialization and mark the API as unavailable if the version number is
 not at least the current version (1).

The check may be overridden by a flag while we wait for
WebAuthNGetApiVersion function to ship.

Bug: 898718
Change-Id: Ic20e55a416d858214b9f444031f4700567933eb4
Reviewed-on: https://chromium-review.googlesource.com/c/1327885
Commit-Queue: Martin Kreichgauer <martinkr@chromium.org>
Reviewed-by: Adam Langley <agl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607005}