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

webrtc/p2p/base/relayport.h

Index: webrtc/p2p/base/relayport.h
diff --git a/webrtc/p2p/base/relayport.h b/webrtc/p2p/base/relayport.h
index 402736c34dbc1747f7992bca521c1256dfc7a68d..bfbba60546a864bef0c4d781e3a4a9c2aab5c00f 100644
--- a/webrtc/p2p/base/relayport.h
+++ b/webrtc/p2p/base/relayport.h
@@ -56,7 +56,8 @@ class RelayPort : public Port {
 
   void PrepareAddress() override;
   Connection* CreateConnection(const Candidate& address,
-                               CandidateOrigin origin) override;
+                               CandidateOrigin origin,
+                               const IceConfig& config) override;
   int SetOption(rtc::Socket::Option opt, int value) override;
   int GetOption(rtc::Socket::Option opt, int* value) override;
   int GetError() override;