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Make the button actually confirm and restart.
Spec: http://go/cros-lang-settings-ux-slide#slide=15

Bug: 1113439
Change-Id: I4d728f8d2e237ceb15139493fadeaf4b7f0b83f1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2379405
Commit-Queue: My Nguyen <myy@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Regan Hsu <hsuregan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#802992}