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In response to the COVID-19 crisis, we launched the "extensions lite"
feature that enables supervised users to install extensions from the
ExtensionInstallWhitelist policy. In the hurry, we didn't add unit
tests for the original CL. This CL adds unit tests for
crrev.com/c/2109977.

Bug: 1063099
Change-Id: Iaca12f16aedf6b1bd7e9a0b2c406ed7631f9942d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2121463Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Toby Huang <tobyhuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#754167}