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Reverted due to a merge conflict with another CL.

Original change's description:
> CrOS - Login Screen - Minor cleanup
>
> Rename AnimationState to UiState and use it to determine the
> visibility of elements. Remove multiple variables in favor of
> UiState.
>
> Bug: 1075994
> Change-Id: I0d7413fb173dadbff22cde0eb3af6f43586bdee2
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2352883
> Commit-Queue: Renato Silva <rrsilva@google.com>
> Reviewed-by: Denis Kuznetsov [CET] <antrim@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#798780}

Bug: 1075994
Change-Id: I0e2c05b692ddb807930455fca6b5a2216c0a16e1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2362183Reviewed-by: Denis Kuznetsov [CET] <antrim@chromium.org>
Reviewed-by: Roman Aleksandrov <raleksandrov@google.com>
Commit-Queue: Renato Silva <rrsilva@google.com>
Cr-Commit-Position: refs/heads/master@{#799680}