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Chrome didn't warn the users about open incognito windows that would
be lost during the update.

Added a general warning in the settings and a personailzed warning,
indicating the count of open incognito windows in the Relaunch Chrome
dialog.

Bug: 810989
Change-Id: Ibd6bf11024e94b0490964f3cdf2236d10c14d998
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1814924Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Greg Thompson <grt@chromium.org>
Commit-Queue: Rohit Agarwal <roagarwal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706010}