Reset TURN port NONCE when a new socket is created.

webrtc/p2p/base/turnport.cc

Index: webrtc/p2p/base/turnport.cc
diff --git a/webrtc/p2p/base/turnport.cc b/webrtc/p2p/base/turnport.cc
index 5ed93dd1d84a05b445aeaeeeed47b3ab26172c3d..37da5de0d51c30e4aeacad634cd8da52abbd6569 100644
--- a/webrtc/p2p/base/turnport.cc
+++ b/webrtc/p2p/base/turnport.cc
@@ -433,6 +433,7 @@ void TurnPort::OnAllocateMismatch() {
   }
   socket_ = NULL;
 
+  ResetNonce();
   PrepareAddress();
   ++allocate_mismatch_retries_;
 }
@@ -927,6 +928,12 @@ bool TurnPort::UpdateNonce(StunMessage* response) {
   return true;
 }
 
+void TurnPort::ResetNonce() {
+  hash_.clear();
+  nonce_.clear();
+  realm_.clear();
+}
+
 static bool MatchesIP(TurnEntry* e, rtc::IPAddress ipaddr) {
   return e->address().ipaddr() == ipaddr;
 }