Added a kEchoCancellation constraint to turn off the audio processing.

content/renderer/media/webrtc_audio_capturer.cc

Index: content/renderer/media/webrtc_audio_capturer.cc
diff --git a/content/renderer/media/webrtc_audio_capturer.cc b/content/renderer/media/webrtc_audio_capturer.cc
index 7363b3e7d13fe436bebf1882e357d1f36026e9e4..9f3703e99cfb6a1cc9fedd7bb1f4ce59b425694e 100644
--- a/content/renderer/media/webrtc_audio_capturer.cc
+++ b/content/renderer/media/webrtc_audio_capturer.cc
@@ -310,7 +310,8 @@ void WebRtcAudioCapturer::SetCapturerSource(
     audio_processor_->OnCaptureFormatChanged(params);
 
     need_audio_processing_ = NeedsAudioProcessing(
-        constraints_, device_info_.device.input.effects);
+        constraints_, device_info_.device.input.effects,
+        device_info_.device.type);
     // Notify all tracks about the new format.
     tracks_.TagAll();
   }