Add config to prune TURN ports

webrtc/p2p/base/stunport.h

Index: webrtc/p2p/base/stunport.h
diff --git a/webrtc/p2p/base/stunport.h b/webrtc/p2p/base/stunport.h
index 82be6fae2ae6714ac5c2c6269d42474fe2ae24e6..1bbe25f0e85bfbe1b02d0c8d679c03fcdc80dbba 100644
--- a/webrtc/p2p/base/stunport.h
+++ b/webrtc/p2p/base/stunport.h
@@ -80,8 +80,7 @@ class UDPPort : public Port {
   const ServerAddresses& server_addresses() const {
     return server_addresses_;
   }
-  void
-  set_server_addresses(const ServerAddresses& addresses) {
+  void set_server_addresses(const ServerAddresses& addresses) {
     server_addresses_ = addresses;
   }
 
@@ -105,6 +104,8 @@ class UDPPort : public Port {
     return protocol == UDP_PROTOCOL_NAME;
   }
 
+  virtual ProtocolType GetProtocol() const { return PROTO_UDP; }
+
   void set_stun_keepalive_delay(int delay) {
     stun_keepalive_delay_ = delay;
   }