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This reverts commit d0392055.

Reason for revert:

Findit (https://goo.gl/kROfz5) identified CL at revision 606686 as the
culprit for failures in the build cycles as shown on:
https://findit-for-me.appspot.com/waterfall/culprit?key=ag9zfmZpbmRpdC1mb3ItbWVyRAsSDVdmU3VzcGVjdGVkQ0wiMWNocm9taXVtL2QwMzkyMDU1ZDg3YWJjYjNiMzExY2Y4YjRkNmE4ZmU5YjFkYzA1NzgM

Sample Failed Build: https://ci.chromium.org/buildbot/chromium/linux-rel/9945

Sample Failed Step: compile

Original change's description:
> fido/win: build Windows WebAuthn API integration unconditionally
> 
> This makes fido/win include webauthn.h from
> //third_party/microsoft_webauthn and drops the USE_WIN_WEBAUTHN_API
> build flag we previously added due to the missing header file.
> 
> The implementation remains behind a default-off feature flag.
> 
> Bug: 898718
> Change-Id: I45e100f8b10cc32ea7e32d2842a63c950b5965bb
> Reviewed-on: https://chromium-review.googlesource.com/c/1325074
> Commit-Queue: Martin Kreichgauer <martinkr@chromium.org>
> Reviewed-by: Adam Langley <agl@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#606686}

Change-Id: I53414fbe41280dbcb7a753599c946f5ef5ebd4ee
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 898718
Reviewed-on: https://chromium-review.googlesource.com/c/1328223
Cr-Commit-Position: refs/heads/master@{#606693}