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This CL fixes tests impacted by the EnableCloseAllTabsConfirmation
feature before submitting the config.
It also moves the Confirmation action sheet logic in the button
selector, in order to have the possibility to disable the feature
after the TabGrid initialisation.

Bug: 1119319
Change-Id: I63dc293c538efbe5a3c38c52a41db9ee1a8cde96
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2526345Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Commit-Queue: Ewann Pellé <ewannpv@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827259}