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This CL is intended to go be patched to M69, so fix can not change any
localized strings. As Polymer localization mechanism does not work with
html in localized values, the slot mechanism is used, and screen code
adjusts innerHtlm for element that is added into slot.

Propper change will be sent as a separate CL.

Bug: 877257
Change-Id: Ibf4eb3f9b751a2f6bb34bf833d860b1cdbfb75e8
Reviewed-on: https://chromium-review.googlesource.com/1219749
Commit-Queue: Denis Kuznetsov <antrim@chromium.org>
Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590677}