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

webrtc/call/call.cc

Index: webrtc/call/call.cc
diff --git a/webrtc/call/call.cc b/webrtc/call/call.cc
index 93b638a44864da8e129ac590c19aa78278ed2445..a6a79789418626dd275556f14bd7616d212fd2f6 100644
--- a/webrtc/call/call.cc
+++ b/webrtc/call/call.cc
@@ -636,9 +636,13 @@
     kv->second = network_route;
     LOG(LS_INFO) << "Network route changed on transport " << transport_name
                  << ": new local network id " << network_route.local_network_id
-                 << " new remote network id "
-                 << network_route.remote_network_id;
-    // TODO(holmer): Update the BWE bitrates.
+                 << " new remote network id " << network_route.remote_network_id
+                 << " Reset bitrate to "
+                 << config_.bitrate_config.start_bitrate_bps << "bps";
+    congestion_controller_->ResetBweAndBitrates(
+        config_.bitrate_config.start_bitrate_bps,
+        config_.bitrate_config.min_bitrate_bps,
+        config_.bitrate_config.max_bitrate_bps);
   }
 }