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This flag will be used so ConfirmInfobars use the new Messages UI.
It will be enabled by default, but it will only work if the core
InfobarUIReboot flag is enabled. This way we'll be able to maintain the
same population that has been using Messages the past releases, and
we'll also be able to turn off this specific feature in case something
goes wrong.


Bug: 961343
Change-Id: Ia69664ece14235fcafdf693c9b6e3d193a57e53f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1827681
Commit-Queue: Sergio Collazos <sczs@chromium.org>
Reviewed-by: Peter Lee <pkl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#701371}