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The controller interface is a remnant from Mus.

Bug: 929449
Test: Build
Change-Id: Ia1cafc13fb404e7f80e31eafa9257acd7b8913d6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1686039
Commit-Queue: Dominik Laskowski <domlaskowski@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#675870}