Make the audio channel communicate network state changes to the call.

webrtc/media/engine/webrtcvideoengine2.cc

Index: webrtc/media/engine/webrtcvideoengine2.cc
diff --git a/webrtc/media/engine/webrtcvideoengine2.cc b/webrtc/media/engine/webrtcvideoengine2.cc
index 0e9866064df142cf7d1529065a818560a674dea3..3847348365637a7ddd292e980d1c975fe815e26f 100644
--- a/webrtc/media/engine/webrtcvideoengine2.cc
+++ b/webrtc/media/engine/webrtcvideoengine2.cc
@@ -1360,7 +1360,9 @@ void WebRtcVideoChannel2::OnRtcpReceived(
 
 void WebRtcVideoChannel2::OnReadyToSend(bool ready) {
   LOG(LS_VERBOSE) << "OnReadyToSend: " << (ready ? "Ready." : "Not ready.");
-  call_->SignalNetworkState(ready ? webrtc::kNetworkUp : webrtc::kNetworkDown);
+  call_->SignalChannelNetworkState(
+      webrtc::MediaType::VIDEO,
+      ready ? webrtc::kNetworkUp : webrtc::kNetworkDown);
 }
 
 bool WebRtcVideoChannel2::MuteStream(uint32_t ssrc, bool mute) {