[u2f] Add TODO, fix style and a typo.

Bug: 763303
Change-Id: I0a47ef951651f026527211b62a25186175d2be25
Reviewed-on: https://chromium-review.googlesource.com/657181
Commit-Queue: Pavel Kalinnikov <[email protected]>
Reviewed-by: Reilly Grant <[email protected]>
Cr-Commit-Position: refs/heads/master@{#500646}
2 files changed