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This removes the mojom interfaces DevDisplayController and DisplayController which
are unused. OutputProtection is still necessary. As OutputProtection is now provided
by ash, OutputProtection has been moved to ash. Additionally, OutputProtection has
been renamed to DisplayOutputProtection. OutputProtection was previously in the
display namespace, so that renaming to DisplayOutputProtection makes it more
obvious what the class is for.

BUG=842365
TEST=none


Change-Id: I1f469032fc991139964b04b9740da64abafa89e0
Reviewed-on: https://chromium-review.googlesource.com/1183892Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: kylechar <kylechar@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585215}