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To fulfill the requirement of accessibility settings page (secondary
window in the Web Kiosk session), the fullscreen mechanism was replaced
from using ash::WindowPinType::kTrustedPinned to SHOW_STATE_FULLSCREEN.
See: https://chromium-review.googlesource.com/c/chromium/src/+/2170227.

But this change introduced the visible shelf which should always be
hidden. In this CL, one new conditional is added to forcedly hidden it
based on the new mechanism.

Bug: 1102359
Change-Id: I30c6b2f71089e924c6b8751c943cce1c4ce994b0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2359131
Commit-Queue: Anqing Zhao <anqing@chromium.org>
Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Reviewed-by: Anatoliy Potapchuk <apotapchuk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799254}