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The App Service's apps::CrostiniApps class now listens for the
preference that enables or disables Crostini, and shows or hides the
Crostini Terminal app respectively.

The App Service + App List UI integration code (the
c/b/ui/app_list/app_service_* changes) also now hard-codes a Crostini
app folder, the same as the existing behavior (with the App Service
disabled), hard-coded into c/b/ui/app_list/crostini/*.

This commit also makes further changes to CrostiniAppModelBuilderTest so
that it works with the Mojo IPC based App Service.

Together, this fixes `unit_tests --enable-features=AppServiceAsh
--gtest_filter="CrostiniAppModelBuilderTest.*"`. It fails before and
passes after this commit.

Note that `unit_tests --gtest_filter="CrostiniAppModelBuilderTest.*"`,
without AppServiceAsh enabled, passes both before and after this commit.

BUG=826982

Change-Id: Id2bd1aa9d4de0389aa94eb5c1ce8211fe5997a11
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1598896
Commit-Queue: Nigel Tao <nigeltao@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Timothy Loh <timloh@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#660687}