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This CL adds the EnableCloseAllTabsConfirmation feature to the
fieldtrial testing config.

Bug: 1119319
Change-Id: Iaa4dae8bdb9151e5199f57a1d66b22bddf5a46f0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2537674Reviewed-by: Jesse Doherty <jwd@chromium.org>
Commit-Queue: Ewann Pellé <ewannpv@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827307}