Change SetOutputScaling to set a single level, not left/right levels.

talk/app/webrtc/webrtcsession.cc

Index: talk/app/webrtc/webrtcsession.cc
diff --git a/talk/app/webrtc/webrtcsession.cc b/talk/app/webrtc/webrtcsession.cc
index 2ab9a1e6969599983724f9ffdce7aebb91b5d418..29164eba755c25519bf2e1b0ba55bad5a1cb1726 100644
--- a/talk/app/webrtc/webrtcsession.cc
+++ b/talk/app/webrtc/webrtcsession.cc
@@ -1246,7 +1246,7 @@ void WebRtcSession::SetAudioPlayout(uint32_t ssrc,
     LOG(LS_ERROR) << "SetAudioPlayout: ssrc is incorrect: " << ssrc;
     return;
   }
-  if (!voice_channel_->SetOutputScaling(ssrc, enable ? 1 : 0, enable ? 1 : 0)) {
+  if (!voice_channel_->SetOutputScaling(ssrc, enable ? 1 : 0)) {
     // Allow that SetOutputScaling fail if |enable| is false but assert
     // otherwise. This in the normal case when the underlying media channel has
     // already been deleted.
@@ -1276,7 +1276,7 @@ void WebRtcSession::SetAudioPlayoutVolume(uint32_t ssrc, double volume) {
     return;
   }
 
-  if (!voice_channel_->SetOutputScaling(ssrc, volume, volume)) {
+  if (!voice_channel_->SetOutputScaling(ssrc, volume)) {
     ASSERT(false);
   }
 }