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..2006391463b276e10d83df436ce1541bc00b82db 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_->SignalSelectedCandidatePairChanged.connect(
+      this, &DtlsTransportChannelWrapper::OnSelectedCandidatePairChanged);
   channel_->SignalConnectionRemoved.connect(this,
       &DtlsTransportChannelWrapper::OnConnectionRemoved);
   channel_->SignalReceivingState.connect(this,
@@ -634,6 +636,13 @@ void DtlsTransportChannelWrapper::OnRouteChange(
   SignalRouteChange(this, candidate);
 }
 
+void DtlsTransportChannelWrapper::OnSelectedCandidatePairChanged(
+    TransportChannel* channel,
+    CandidatePairInterface* selected_candidate_pair) {
+  ASSERT(channel == channel_);
+  SignalSelectedCandidatePairChanged(this, selected_candidate_pair);
+}
+
 void DtlsTransportChannelWrapper::OnConnectionRemoved(
     TransportChannelImpl* channel) {
   ASSERT(channel == channel_);