GitLab

- Renamed FingerprintUnlockState to FingerprintState
- FingerprintState no longer has AUTH_FAILED and AUTH_SUCCESS. FingerprintState
  instead determines if fingerprint is enabled. A seperate mojom method is used
  to notify the ash that an authentication attempt has taken place.
- Reordered fingerprint mojom method so it is next to PIN
- Eliminated ScreenLocker::FingerprintState, which duplicated the mojom type
- Fixed a bug in screen_locker.cc where timing out PIN depended on fingerprint
  being enabled.
- Backlights being forced off is now reset only after an authentication attempt.
  This means that fingerprint timing out will not turn the display on.
- Lock screen is now initialized with full fingerprint state instead of a bool.
- Renamed some methods to increase clarity

Bug: 897226
Change-Id: I841c7bbdd32730532148ddae96e1b490bee4eb0a
Reviewed-on: https://chromium-review.googlesource.com/c/1291998Reviewed-by: Greg Kerr <kerrnel@chromium.org>
Reviewed-by: Wenzhao (Colin) Zang <wzang@chromium.org>
Commit-Queue: Jacob Dufault <jdufault@chromium.org>
Cr-Commit-Position: refs/heads/master@{#602450}