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For Crostini, Extension, built-in apps, the AppService is used to
valid the app id. For ARC apps, ArcAppListPrefs is used, as ARC apps
have some very special cases, e.g. PlayStore. ARC tests also assume
synchronous behaviour, and will need more refactoring so the AppService
can be used.

Related unit tests has been fixed. Extension apps in test cases use
OnExtensionLoaded to add extension apps, so set the extension name
so that we can use AppService to dump the apps name.

BUG=1002351

Change-Id: Ia7f589de82ca226eb05dd1706ab95229699d6fdb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1803015
Commit-Queue: Nancy Wang <nancylingwang@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697525}