Disable the residual echo detector in audio mixer.

webrtc/modules/audio_mixer/frame_combiner.cc

Index: webrtc/modules/audio_mixer/frame_combiner.cc
diff --git a/webrtc/modules/audio_mixer/frame_combiner.cc b/webrtc/modules/audio_mixer/frame_combiner.cc
index e47f8e75e263c9a0ef8dc93655547588fadb5eb5..3a7f61812bd1b4b0caea50297489ab0020e45b26 100644
--- a/webrtc/modules/audio_mixer/frame_combiner.cc
+++ b/webrtc/modules/audio_mixer/frame_combiner.cc
@@ -135,9 +135,14 @@ void CombineMultipleFrames(
 std::unique_ptr<AudioProcessing> CreateLimiter() {
   Config config;
   config.Set<ExperimentalAgc>(new ExperimentalAgc(false));
+
   std::unique_ptr<AudioProcessing> limiter(AudioProcessing::Create(config));
   RTC_DCHECK(limiter);
 
+  webrtc::AudioProcessing::Config apm_config;
+  apm_config.residual_echo_detector.enabled = false;
+  limiter->ApplyConfig(apm_config);
+
   const auto check_no_error = [](int x) {
     RTC_DCHECK_EQ(x, AudioProcessing::kNoError);
   };