Update the BWE when the network route changes.

webrtc/modules/bitrate_controller/bitrate_controller_impl.h

Index: webrtc/modules/bitrate_controller/bitrate_controller_impl.h
diff --git a/webrtc/modules/bitrate_controller/bitrate_controller_impl.h b/webrtc/modules/bitrate_controller/bitrate_controller_impl.h
index 5a61379ce01d23da8c0364483be251c765cb3883..91f0902cb2fc5ede14a7f0a743e855efe8bc95dc 100644
--- a/webrtc/modules/bitrate_controller/bitrate_controller_impl.h
+++ b/webrtc/modules/bitrate_controller/bitrate_controller_impl.h
@@ -46,6 +46,10 @@ class BitrateControllerImpl : public BitrateController {
                    int min_bitrate_bps,
                    int max_bitrate_bps) override;
 
+  void ResetBitrates(int bitrate_bps,
+                     int min_bitrate_bps,
+                     int max_bitrate_bps) override;
+
   void UpdateDelayBasedEstimate(uint32_t bitrate_bps) override;
 
   void SetReservedBitrate(uint32_t reserved_bitrate_bps) override;