Create a new connection if a candidate reuses an address

webrtc/p2p/base/port.h

Index: webrtc/p2p/base/port.h
diff --git a/webrtc/p2p/base/port.h b/webrtc/p2p/base/port.h
index 704fbb7a65416d42fab37cd8858a43fcdcc0292d..07ca5b0a168833fcc13a8f1259c6359c9ad6edaf 100644
--- a/webrtc/p2p/base/port.h
+++ b/webrtc/p2p/base/port.h
@@ -346,6 +346,9 @@ class Port : public PortInterface, public rtc::MessageHandler,
     return rtc::DSCP_NO_CHANGE;
   }
 
+  // Extra work to be done in subclasses when a connection is destroyed.
+  virtual void HandleConnectionDestroyed(Connection* conn) {}
+
  private:
   void Construct();
   // Called when one of our connections deletes itself.