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Moves the user feedback delegate protocol implementation to the scene
controller.

Bug: none
Change-Id: I5255321c4182f0d85c2ac4beccf92178b437f56a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1865312
Commit-Queue: Stepan Khapugin <stkhapugin@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720935}