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

webrtc/p2p/base/port.cc

 /*
  *  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 1072 matching lines @@
 void Connection::Destroy() {
   LOG_J(LS_VERBOSE, this) << "Connection destroyed";
   port_->thread()->Post(RTC_FROM_HERE, this, MSG_DELETE);
 }
 
 void Connection::FailAndDestroy() {
   set_state(Connection::STATE_FAILED);
   Destroy();
 }
 
+void Connection::FailAndPrune() {
+  set_state(Connection::STATE_FAILED);
+  Prune();
+}
+
 void Connection::PrintPingsSinceLastResponse(std::string* s, size_t max) {
   std::ostringstream oss;
   oss << std::boolalpha;
   if (pings_since_last_response_.size() > max) {
     for (size_t i = 0; i < max; i++) {
       const SentPing& ping = pings_since_last_response_[i];
       oss << rtc::hex_encode(ping.id) << " ";
     }
     oss << "... " << (pings_since_last_response_.size() - max) << " more";
   } else {
@@ skipping 428 matching lines @@
     ASSERT(sent < 0);
     error_ = port_->GetError();
     stats_.sent_discarded_packets++;
   } else {
     send_rate_tracker_.AddSamples(sent);
   }
   return sent;
 }
 
 }  // namespace cricket