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Add support for PinUvAuthToken on large blobs.

https://w3c.github.io/webauthn/#sctn-large-blob-extension

Bug: 1114875
Change-Id: I57a094eed4cb0cd3d8b20722804826a46ccf0e27
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2422707
Commit-Queue: Nina Satragno <nsatragno@chromium.org>
Auto-Submit: Nina Satragno <nsatragno@chromium.org>
Reviewed-by: Martin Kreichgauer <martinkr@google.com>
Cr-Commit-Position: refs/heads/master@{#809523}