Remove candidates when doing continual gathering

webrtc/p2p/base/p2ptransportchannel.h

Index: webrtc/p2p/base/p2ptransportchannel.h
diff --git a/webrtc/p2p/base/p2ptransportchannel.h b/webrtc/p2p/base/p2ptransportchannel.h
index f2e93153432be261dc72083eb5a1ad948397d546..fb0afec6972eecef3cac9ed0e5fbbcafa2049eb6 100644
--- a/webrtc/p2p/base/p2ptransportchannel.h
+++ b/webrtc/p2p/base/p2ptransportchannel.h
@@ -88,6 +88,7 @@ class P2PTransportChannel : public TransportChannelImpl,
     return gathering_state_;
   }
   void AddRemoteCandidate(const Candidate& candidate) override;
+  void RemoveRemoteCandidate(const Candidate& candidate) override;
   // Sets the receiving timeout and gather_continually.
   // This also sets the check_receiving_delay proportionally.
   void SetIceConfig(const IceConfig& config) override;
@@ -227,6 +228,7 @@ class P2PTransportChannel : public TransportChannelImpl,
                         const std::string& remote_username,
                         bool port_muxed);
   void OnPortDestroyed(PortInterface* port);
+  void OnPortNetworkInactive(PortInterface* port);
   void OnRoleConflict(PortInterface* port);
 
   void OnConnectionStateChange(Connection* connection);