Do not delete a connection in the turn port with permission error or refresh error.

webrtc/p2p/base/port.h

 /*
  *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 505 matching lines @@
   void set_receiving_timeout(int64_t receiving_timeout_ms) {
     receiving_timeout_ = receiving_timeout_ms;
   }
 
   // Makes the connection go away.
   void Destroy();
 
   // Makes the connection go away, in a failed state.
   void FailAndDestroy();
 
+  // Prunes the connection and sets its state to STATE_FAILED,
+  // It will not be used or pinged except that it can still receive packets.

[pthatcher1, 2016/06/22 18:43:34]

I will not be used or send pings, right?  "be pinged" means it receives pings,
which it still can receive.

+  void FailAndPrune();
+
   // Checks that the state of this connection is up-to-date.  The argument is
   // the current time, which is compared against various timeouts.
   void UpdateState(int64_t now);
 
   // Called when this connection should try checking writability again.
   int64_t last_ping_sent() const { return last_ping_sent_; }
   void Ping(int64_t now);
   void ReceivedPingResponse(int rtt);
   int64_t last_ping_response_received() const {
     return last_ping_response_received_;
@@ skipping 138 matching lines @@
            const rtc::PacketOptions& options) override;
   int GetError() override { return error_; }
 
  private:
   int error_ = 0;
 };
 
 }  // namespace cricket
 
 #endif  // WEBRTC_P2P_BASE_PORT_H_