Use continual gathering to restore backup connections

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 06efd2d3c235c4e976fda6f610c187741ac7542f..828a302d5729fbdebae7d2bb089a8ef99106a39d 100644
--- a/webrtc/p2p/base/port.h
+++ b/webrtc/p2p/base/port.h
@@ -142,6 +142,8 @@ class Port : public PortInterface, public rtc::MessageHandler,
   virtual const std::string& Type() const { return type_; }
   virtual rtc::Network* Network() const { return network_; }
 
+  virtual void FailAndDestroyConnections();
+
   // Methods to set/get ICE role and tiebreaker values.
   IceRole GetIceRole() const { return ice_role_; }
   void SetIceRole(IceRole role) { ice_role_ = role; }