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This CL is a quick-fix for the ephemeral use-case. known_user does not
persist the data for the ephemeral user. As a result on the lock screen
users can't get their last login input method.

Change-Id: I0722c741906ecfd35cb031ca6db337c3302e1b3d
Bug: 1092884
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2429067
Commit-Queue: Roman Sorokin [CET] <rsorokin@chromium.org>
Commit-Queue: Alexander Alekseev <alemate@chromium.org>
Auto-Submit: Roman Sorokin [CET] <rsorokin@chromium.org>
Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810481}