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This class is responsible for displaying and handling all EasyUnlock notifications.

Originally, EasyUnlock notifications were shown by a component app, but this app is now deprecated and we are migrating EasyUnlock natively for v2.

BUG=726791

Review-Url: https://codereview.chromium.org/2968323002
Cr-Commit-Position: refs/heads/master@{#488522}