Make PacketTransportInternal inherit from PacketTransportInterface.

webrtc/api/ortc/udptransportinterface.h

 /*
  *  Copyright 2017 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.
  */
 
 #ifndef WEBRTC_API_ORTC_UDPTRANSPORTINTERFACE_H_
 #define WEBRTC_API_ORTC_UDPTRANSPORTINTERFACE_H_
 
 #include "webrtc/api/ortc/packettransportinterface.h"
 #include "webrtc/api/proxy.h"
 #include "webrtc/base/socketaddress.h"
 
 namespace webrtc {
 
 // Interface for a raw UDP transport (not using ICE), meaning a combination of
 // a local/remote IP address/port.
 //
 // An instance can be instantiated using OrtcFactory.
 //
 // Each instance reserves a UDP port, which will be freed when the
 // UdpTransportInterface destructor is called.
 //
 // Calling SetRemoteAddress sets the destination of outgoing packets; without a
 // destination, packets can't be sent, but they can be received.
-class UdpTransportInterface : virtual public PacketTransportInterface {
+class UdpTransportInterface : public virtual PacketTransportInterface {
  public:
   // Get the address of the socket allocated for this transport.
   virtual rtc::SocketAddress GetLocalAddress() const = 0;
 
   // Sets the address to which packets will be delivered.
   //
   // Calling with a "nil" (default-constructed) address is legal, and unsets
   // any previously set destination.
   //
   // However, calling with an incomplete address (port or IP not set) will
   // fail.
   virtual bool SetRemoteAddress(const rtc::SocketAddress& dest) = 0;
   // Simple getter. If never set, returns nil address.
   virtual rtc::SocketAddress GetRemoteAddress() const = 0;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_API_ORTC_UDPTRANSPORTINTERFACE_H_