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This is not used in views lock screen. The implementation is also complicated
and possibly crashy if UnlockOnLoginSuccess is called twice.

One side-effect of this cleanup is that views lock screen now dismisses 400ms
faster, because it was never calling UnlockOnLoginSuccess and instead relied on
the fallback handler.

Bug: 902451
Change-Id: I16c02dab2b263ee7fa304490e3df0bc002252a41
Reviewed-on: https://chromium-review.googlesource.com/c/1320794Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Jacob Dufault <jdufault@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606064}