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This update introduces a new Polymer element for the Terms Of Service
screen for public sessions.

Bug: 1007867
Change-Id: I4c71e2d1ec58683ada0155f54087664bc029e957
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1856098
Commit-Queue: Renato Silva <rrsilva@google.com>
Reviewed-by: Denis Kuznetsov [CET] <antrim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711324}