GitLab

Moves a bunch of methdos and properties that aren't used in
MainController to SceneController and updates call sites.

Bug: none
Change-Id: Ib5b26f5cd402cb435426f23f060c53dac522104a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2012382
Commit-Queue: Stepan Khapugin <stkhapugin@chromium.org>
Auto-Submit: Stepan Khapugin <stkhapugin@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734533}