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

webrtc/p2p/base/p2ptransportchannel.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 1331 matching lines @@
 // how a TCP connection is kicked into reconnecting on the active side.
 bool P2PTransportChannel::IsPingable(Connection* conn, int64_t now) {
   const Candidate& remote = conn->remote_candidate();
   // We should never get this far with an empty remote ufrag.
   ASSERT(!remote.username().empty());
   if (remote.username().empty() || remote.password().empty()) {
     // If we don't have an ICE ufrag and pwd, there's no way we can ping.
     return false;
   }
 
+  // A failed connection will not be pinged.
+  if (conn->state() == Connection::STATE_FAILED) {
+    return false;
+  }
+
   // An never connected connection cannot be written to at all, so pinging is
   // out of the question. However, if it has become WRITABLE, it is in the
   // reconnecting state so ping is needed.
   if (!conn->connected() && !conn->writable()) {
     return false;
   }
 
   // If the channel is weakly connected, ping all connections.
   if (weak()) {
     return true;
@@ skipping 348 matching lines @@
 
   // During the initial state when nothing has been pinged yet, return the first
   // one in the ordered |connections_|.
   return *(std::find_if(connections_.begin(), connections_.end(),
                         [conn1, conn2](Connection* conn) {
                           return conn == conn1 || conn == conn2;
                         }));
 }
 
 }  // namespace cricket