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Reverts changes that maintain the downstream tests compileable.
This should land after CL 2277302 in ios_internal which updates the
call site to use MainController instead of SceneController.

Bug: none
Change-Id: I028c096279fbd9dd5b9dbfd8e7720c9818a1580b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1958121
Commit-Queue: Stepan Khapugin <stkhapugin@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#727475}