Chromium has adopted Opus 1.2.1 which allows 120ms frame encoding. It is time to turn on the switch for building WebRTC with this feature. Bug: webrtc:8042 TBR: kjellander@webrtc.org Change-Id: I644b47cfb56f835695ef1263741cda6e3ee3d862 Reviewed-on: https://chromium-review.googlesource.com/586725 Commit-Queue: Minyue Li <minyue@webrtc.org> Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Reviewed-by: Felicia Lim <flim@webrtc.org> Cr-Commit-Position: refs/heads/master@{#19173}