Only try to pair protocol matching candidates for creating connections.

webrtc/p2p/base/stunport.cc

Index: webrtc/p2p/base/stunport.cc
diff --git a/webrtc/p2p/base/stunport.cc b/webrtc/p2p/base/stunport.cc
index f99965bd72ee6672c46f2c37b35445dd425e1637..4c95222a92e216b30af9a610750e122559a3f716 100644
--- a/webrtc/p2p/base/stunport.cc
+++ b/webrtc/p2p/base/stunport.cc
@@ -253,9 +253,10 @@ void UDPPort::MaybePrepareStunCandidate() {
 }
 
 Connection* UDPPort::CreateConnection(const Candidate& address,
-                                       CandidateOrigin origin) {
-  if (address.protocol() != "udp")
+                                      CandidateOrigin origin) {
+  if (!ProtocolMatch(address.protocol())) {
     return NULL;
+  }
 
   if (!IsCompatibleAddress(address.address())) {
     return NULL;