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Devices in Demo Mode are enrolled into the cros-demo-mode.com domain,
which uses enterprise policy to set the list of force-installed apps
and which of those apps are force-pinned to the shelf. This lets us
choose which first and third party apps to feature in the demo.

A few demo apps only work online. When a device in Demo Mode is
offline, we don't want to feature those apps, but they're
unconditionally force-pinned by policy.

This CL updates the shelf's pinned policy pref handling to ignore
certain apps pinned by policy when the device is in Demo Mode and
offline. The user can still pin and unpin those apps themselves.

Bug: 870846
Change-Id: Ie15ea89f77fd5ed6a789614a83c39bb2aee286d2
Reviewed-on: https://chromium-review.googlesource.com/1179318
Commit-Queue: Michael Giuffrida <michaelpg@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#586015}