Reset the BWE when the network changes

webrtc/p2p/base/dtlstransportchannel.cc

Index: webrtc/p2p/base/dtlstransportchannel.cc
diff --git a/webrtc/p2p/base/dtlstransportchannel.cc b/webrtc/p2p/base/dtlstransportchannel.cc
index 33b5b6f268e6cbc298f170b8504ca422116939d2..c6a991b20d5bf0d5d731d94bd2ebc561c73d9a17 100644
--- a/webrtc/p2p/base/dtlstransportchannel.cc
+++ b/webrtc/p2p/base/dtlstransportchannel.cc
@@ -119,6 +119,8 @@ DtlsTransportChannelWrapper::DtlsTransportChannelWrapper(
       &DtlsTransportChannelWrapper::OnRoleConflict);
   channel_->SignalRouteChange.connect(this,
       &DtlsTransportChannelWrapper::OnRouteChange);
+  channel_->SignalSelectedConnectionChanged.connect(
+      this, &DtlsTransportChannelWrapper::OnSelectedConnectionChanged);
   channel_->SignalConnectionRemoved.connect(this,
       &DtlsTransportChannelWrapper::OnConnectionRemoved);
   channel_->SignalReceivingState.connect(this,
@@ -634,6 +636,13 @@ void DtlsTransportChannelWrapper::OnRouteChange(
   SignalRouteChange(this, candidate);
 }
 
+void DtlsTransportChannelWrapper::OnSelectedConnectionChanged(
+    TransportChannel* channel,
+    Connection* selected_connection) {
+  ASSERT(channel == channel_);
+  SignalSelectedConnectionChanged(this, selected_connection);
+}
+
 void DtlsTransportChannelWrapper::OnConnectionRemoved(
     TransportChannelImpl* channel) {
   ASSERT(channel == channel_);