Degradation preference could be changed before video send stream is configured which would cause a crash. Bug: None Change-Id: If970e66fba0b9fdb9da789066861d919874de119 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/164463 Reviewed-by: Niels Moller <nisse@webrtc.org> Commit-Queue: Mirta Dvornicic <mirtad@webrtc.org> Cr-Commit-Position: refs/heads/master@{#30141}