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After earlier re-factoring, these tests no longer actually test
any code in display_preferences.cc.

Bug: none
Change-Id: Ie8d81f6efafb23918cda3af892ab48ee63cbfb29
Reviewed-on: https://chromium-review.googlesource.com/848247Reviewed-by: Weidong Guo <weidongg@chromium.org>
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#526863}