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It was running in Chrome's unit_tests for historical reasons.

* Remove usage of Chrome's TestExtensionPrefs by instantiating our own
  simplified ExtensionPrefs.
* Move ShellAppSorting to NullAppSorting so it can be used for the above
  as well as app_shell.

BUG=397164
TEST=extensions_unittests

Review URL: https://codereview.chromium.org/549663002

Cr-Commit-Position: refs/heads/master@{#293768}