Adding IceConfig option to assume TURN/TURN candidate pairs will work.

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 ff0c2922de28334f285e4592aefb9dc78d6db4ad..d4d6caf1422b2458405574b687500dd198831843 100644
--- a/webrtc/p2p/base/turnport.cc
+++ b/webrtc/p2p/base/turnport.cc
@@ -439,7 +439,8 @@ void TurnPort::OnAllocateMismatch() {
 }
 
 Connection* TurnPort::CreateConnection(const Candidate& address,
-                                       CandidateOrigin origin) {
+                                       CandidateOrigin origin,
+                                       const IceConfig& config) {
   // TURN-UDP can only connect to UDP candidates.
   if (!SupportsProtocol(address.protocol())) {
     return NULL;
@@ -461,7 +462,7 @@ Connection* TurnPort::CreateConnection(const Candidate& address,
   // and TURN candidate later.
   for (size_t index = 0; index < Candidates().size(); ++index) {
     if (Candidates()[index].type() == RELAY_PORT_TYPE) {
-      ProxyConnection* conn = new ProxyConnection(this, index, address);
+      ProxyConnection* conn = new ProxyConnection(this, index, address, config);
       AddOrReplaceConnection(conn);
       return conn;
     }