Start probes only after network is connected.

webrtc/modules/congestion_controller/congestion_controller.cc

Index: webrtc/modules/congestion_controller/congestion_controller.cc
diff --git a/webrtc/modules/congestion_controller/congestion_controller.cc b/webrtc/modules/congestion_controller/congestion_controller.cc
index 0dafdf65fd224f80d47cbf0ef5284534c979b4b3..accc1411f995487895f1ba35bb1851538c83948b 100644
--- a/webrtc/modules/congestion_controller/congestion_controller.cc
+++ b/webrtc/modules/congestion_controller/congestion_controller.cc
@@ -297,6 +297,7 @@ void CongestionController::SignalNetworkState(NetworkState state) {
     rtc::CritScope cs(&critsect_);
     network_state_ = state;
   }
+  probe_controller_->OnNetworkStateChanged(state);
   MaybeTriggerOnNetworkChanged();
 }