Standardize usage of virtual/override/final in media/

media/cast/test/utility/standalone_cast_environment.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MEDIA_CAST_TEST_UTILITY_STANDALONE_CAST_ENVIRONMENT_H_
 #define MEDIA_CAST_TEST_UTILITY_STANDALONE_CAST_ENVIRONMENT_H_
 
 #include "base/threading/thread.h"
 #include "base/threading/thread_checker.h"
 #include "media/cast/cast_environment.h"
@@ skipping 10 matching lines @@
 class StandaloneCastEnvironment : public CastEnvironment,
                                   public base::ThreadChecker {
  public:
   StandaloneCastEnvironment();
 
   // Stops all threads backing the task runners, blocking the caller until
   // complete.
   void Shutdown();
 
  protected:
-  virtual ~StandaloneCastEnvironment();
+  ~StandaloneCastEnvironment() override;
 
   base::Thread main_thread_;
   base::Thread audio_thread_;
   base::Thread video_thread_;
 
   DISALLOW_COPY_AND_ASSIGN(StandaloneCastEnvironment);
 };
 
 }  // namespace cast
 }  // namespace media
 
 #endif  // MEDIA_CAST_TEST_UTILITY_STANDALONE_CAST_ENVIRONMENT_H_