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Also, bring back IsLoggedInAsWebKioskApp() for permissions handling.

Bug: 1015383,1006230
Change-Id: I66dfda221fd828443f580746c68faf47757d4137
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1911797
Commit-Queue: Anatoliy Potapchuk <apotapchuk@chromium.org>
Reviewed-by: Sergey Poromov <poromov@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714944}