Only try to pair protocol matching candidates for creating connections.

webrtc/p2p/base/stunport.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 235 matching lines @@
   // prepare STUN candidate.
   if (!server_addresses_.empty()) {
     SendStunBindingRequests();
   } else {
     // Port is done allocating candidates.
     MaybeSetPortCompleteOrError();
   }
 }
 
 Connection* UDPPort::CreateConnection(const Candidate& address,
-                                       CandidateOrigin origin) {
-  if (address.protocol() != "udp")
+                                      CandidateOrigin origin) {
+  if (!SupportsProtocol(address.protocol())) {
     return NULL;
+  }
 
   if (!IsCompatibleAddress(address.address())) {
     return NULL;
   }
 
   if (SharedSocket() && Candidates()[0].type() != LOCAL_PORT_TYPE) {
     ASSERT(false);
     return NULL;
   }
 
@@ skipping 235 matching lines @@
   const std::vector<Candidate>& existing_candidates = Candidates();
   std::vector<Candidate>::const_iterator it = existing_candidates.begin();
   for (; it != existing_candidates.end(); ++it) {
     if (it->address() == addr)
       return true;
   }
   return false;
 }
 
 }  // namespace cricket