GitLab

Call -teardownUI when the scene disconnects. There's even a few comments
in SceneController saying this should happen, but we never added a call.

Bug: none
Change-Id: If8994dd387a3216411401f4d82eeca24b05fe792
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2231063
Commit-Queue: Stepan Khapugin <stkhapugin@chromium.org>
Commit-Queue: Mark Cogan <marq@chromium.org>
Auto-Submit: Stepan Khapugin <stkhapugin@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#775127}