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This will help us deduplicate some parts of kiosk session startup code.

Bug: 1086414
Change-Id: I783ab28fa7fb2b2c9c7e7410a5802d2a98b94686
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2215845Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Commit-Queue: Anatoliy Potapchuk <apotapchuk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774085}