Mark ~DirectTransport with "override."

webrtc/test/direct_transport.h

 /*
  *  Copyright (c) 2013 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_TEST_DIRECT_TRANSPORT_H_
@@ skipping 28 matching lines @@
                   Call* send_call,
                   std::unique_ptr<Demuxer> demuxer);
 
   // This deprecated variant always uses MediaType::VIDEO.
   RTC_DEPRECATED explicit DirectTransport(Call* send_call)
       : DirectTransport(
             FakeNetworkPipe::Config(),
             send_call,
             std::unique_ptr<Demuxer>(new ForceDemuxer(MediaType::VIDEO))) {}
 
-  ~DirectTransport();
+  ~DirectTransport() override;
 
   void SetConfig(const FakeNetworkPipe::Config& config);
 
   virtual void StopSending();
   // TODO(holmer): Look into moving this to the constructor.
   virtual void SetReceiver(PacketReceiver* receiver);
 
   bool SendRtp(const uint8_t* data,
                size_t length,
                const PacketOptions& options) override;
@@ skipping 27 matching lines @@
   Clock* const clock_;
 
   bool shutting_down_;
 
   FakeNetworkPipe fake_network_;
 };
 }  // namespace test
 }  // namespace webrtc
 
 #endif  // WEBRTC_TEST_DIRECT_TRANSPORT_H_