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This property was used before there was an "official" way
to access scene controllers. Now it can be fetched through
the app state.

Change-Id: I11abb2508323000b2ed317f9ad2de12f748510d6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2299631Reviewed-by: Mark Cogan <marq@chromium.org>
Commit-Queue: Stepan Khapugin <stkhapugin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#788695}