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Previously, if the browser process crashed during Web kiosk session, we
would have just exited the session. This cl leverages the new kiosk
launch logic, where we abstract out KioskAppLauncher.

Bug: 1054382
Change-Id: Ia8bed81f839b7f7f81d703e8a03af58e768d0fb9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2279121
Commit-Queue: Anatoliy Potapchuk <apotapchuk@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Anqing Zhao <anqing@chromium.org>
Cr-Commit-Position: refs/heads/master@{#786287}