Disable the software noise suppressor on iOS devices

webrtc/media/engine/webrtcvoiceengine.cc

Index: webrtc/media/engine/webrtcvoiceengine.cc
diff --git a/webrtc/media/engine/webrtcvoiceengine.cc b/webrtc/media/engine/webrtcvoiceengine.cc
index eb8399494c54eaa9c9f211fe70bf971efeb5a486..c7fd7689139908c1b5929af60a9213b969297ed2 100644
--- a/webrtc/media/engine/webrtcvoiceengine.cc
+++ b/webrtc/media/engine/webrtcvoiceengine.cc
@@ -615,10 +615,12 @@ bool WebRtcVoiceEngine::ApplyOptions(const AudioOptions& options_in) {
   }
 
 #if defined(WEBRTC_IOS)
-  // On iOS, VPIO provides built-in EC and AGC.
+  // On iOS, VPIO provides built-in EC, NS and AGC.
   options.echo_cancellation = rtc::Optional<bool>(false);
   options.auto_gain_control = rtc::Optional<bool>(false);
-  LOG(LS_INFO) << "Always disable AEC and AGC on iOS. Use built-in instead.";
+  options.noise_suppression = rtc::Optional<bool>(false);
+  LOG(LS_INFO)
+      << "Always disable AEC, NS and AGC on iOS. Use built-in instead.";
 #elif defined(ANDROID)
   ec_mode = webrtc::kEcAecm;
 #endif