Remove lock screen note code from login web UI

BUG=929466

Change-Id: I4e58d5fb14ce82097665c5bad34a1f779b38c04f
Reviewed-on: https://chromium-review.googlesource.com/c/1457667
Commit-Queue: Toni Baržić <tbarzic@chromium.org>
Reviewed-by: Jacob Dufault <jdufault@chromium.org>
Cr-Commit-Position: refs/heads/master@{#630619}
13 files changed