Change the threshold in ProcessNoLossChangeBitRateVP9. Bug: webrtc:8442 Change-Id: Ic924a60f60c57cc2c990430cb6c70fdbefec97f4 Reviewed-on: https://webrtc-review.googlesource.com/15840 Commit-Queue: Rasmus Brandt <brandtr@webrtc.org> Reviewed-by: Rasmus Brandt <brandtr@webrtc.org> Cr-Commit-Position: refs/heads/master@{#20436}