This change makes the fix for too long delays during Opus DTX periods permanent. The fix has up until now been under an experiment, named WebRTC-NetEqOpusDtxDelayFix. Bug: webrtc:8488,chromium:780849 Change-Id: I006abb67f96d9d7880bf2215d7d6b52db6cbbfbc Reviewed-on: https://webrtc-review.googlesource.com/44420 Reviewed-by: Ivo Creusen <ivoc@webrtc.org> Commit-Queue: Henrik Lundin <henrik.lundin@webrtc.org> Cr-Commit-Position: refs/heads/master@{#21786}