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

webrtc/p2p/base/port.cc

Index: webrtc/p2p/base/port.cc
diff --git a/webrtc/p2p/base/port.cc b/webrtc/p2p/base/port.cc
index c0e8d9770d8b11fb5e63b3c0221247d6eb2e7e82..931e3dd14e658b8753152b4ef079f605c8b387bc 100644
--- a/webrtc/p2p/base/port.cc
+++ b/webrtc/p2p/base/port.cc
@@ -1090,6 +1090,11 @@ void Connection::FailAndDestroy() {
   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;