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These strings will be used for the dialog that appears when the user:
- is closing the tab or window that initiated a Picture-in-Picture
session, or
- is navigating away from a page that initiated a Picture-in-Picture
session.

Dialog implementation is in progress.

Bug: 809982
TBR: grt@chromium.org
Change-Id: I060fb2f21fc93361aeb11f4b605b5012d369e28c
Reviewed-on: https://chromium-review.googlesource.com/1112304
Commit-Queue: apacible <apacible@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569750}