This reverts commit ba2840ce4eba4adebe7c968adcf7689caedccfa9. Reason for revert: Looks like this breaks all VP9 tests on the Chromium level, for Mac: https://ci.chromium.org/buildbot/chromium.webrtc/Mac%20Tester/85866 Search for TIMED OUT in for instance https://logs.chromium.org/logs/chromium/bb/chromium.webrtc/Mac_Tester/85866/+/recipes/steps/browser_tests/0/stdout (it times out because the video is frozen). Original change's description: > Various VP9 high fps fixes > > - Enable flexible mode in loopback tools and quality tests > - Ensure duplicate references are not set by the sender in video header > - Reset first active spatial layer on keyframe in encoder > - Make vp9 encoder to not generate spatial references for first active > layer with external reference control in svc flexible mode > > Bug: webrtc:10049 > Change-Id: If9ff576ea8a1a2fef6116b17b5b5adff08c5f8c6 > Reviewed-on: https://webrtc-review.googlesource.com/c/112080 > Commit-Queue: Ilya Nikolaevskiy <ilnik@webrtc.org> > Reviewed-by: Sergey Silkin <ssilkin@webrtc.org> > Cr-Commit-Position: refs/heads/master@{#25795} TBR=ilnik@webrtc.org,ssilkin@webrtc.org # Not skipping CQ checks because original CL landed > 1 day ago. Bug: webrtc:10049 Change-Id: Ie6a7daf6414337173fec38c5ff546d509951cba6 Reviewed-on: https://webrtc-review.googlesource.com/c/112400 Reviewed-by: Patrik Höglund <phoglund@webrtc.org> Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org> Commit-Queue: Patrik Höglund <phoglund@webrtc.org> Cr-Commit-Position: refs/heads/master@{#25842}