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This fixes a regression that caused cancelling out of the native Windows
WebAuthn UI would show an error dialog, when the request should have
just been ended right away.

The error dialog in question contained a "retry" button, which was non-
functional because it just returned the UI to an empty transport
selection UI. Conceptually, we don't want to offer the "retry" button on
Windows, because the Windows UI brings its own retry behavior for
certain cases (e.g. user touched the wrong security key). Hence, this
change also extends the retry logic on
ChromeAuthenticatorRequestDelegate to hide retry buttons after
dispatching a request to the Windows API.

Bug: 985597
Change-Id: Ie02721068c847156222e81f193fd446929ca996f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1710741
Commit-Queue: Martin Kreichgauer <martinkr@chromium.org>
Reviewed-by: Nina Satragno <nsatragno@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#680277}