Reland of "Revert of Update the BWE when the network route changes.

webrtc/base/networkroute.h

Index: webrtc/base/networkroute.h
diff --git a/webrtc/base/networkroute.h b/webrtc/base/networkroute.h
index 52fa6d612f47d93983bbfdac973388ff0ce5a70e..a34e6d304d4bd4538baf40b0a3df7abf6921fa6e 100644
--- a/webrtc/base/networkroute.h
+++ b/webrtc/base/networkroute.h
@@ -30,10 +30,11 @@
         last_sent_packet_id(-1) {}
 
   // The route is connected if the local and remote network ids are provided.
-  NetworkRoute(uint16_t local_net_id,
+  NetworkRoute(bool connected,
+               uint16_t local_net_id,
                uint16_t remote_net_id,
                int last_packet_id)
-      : connected(true),
+      : connected(connected),
         local_network_id(local_net_id),
         remote_network_id(remote_net_id),
         last_sent_packet_id(last_packet_id) {}