Standardize usage of virtual/override/final in chrome/browser/media_galleries

chrome/browser/media_galleries/fileapi/safe_audio_video_checker.h

 // Copyright 2013 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 CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_SAFE_AUDIO_VIDEO_CHECKER_H_
 #define CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_SAFE_AUDIO_VIDEO_CHECKER_H_
 
 #include "base/basictypes.h"
 #include "base/callback_forward.h"
 #include "base/files/file.h"
@@ skipping 21 matching lines @@
   void Start();
 
  private:
   enum State {
     INITIAL_STATE,
     PINGED_STATE,
     STARTED_STATE,
     FINISHED_STATE
   };
 
-  virtual ~SafeAudioVideoChecker();
+  ~SafeAudioVideoChecker() override;
 
   // Starts validation once the utility process has been started.
   virtual void OnProcessStarted();
 
   // Notification of the result from the utility process.
   void OnCheckingFinished(bool valid);
 
   // UtilityProcessHostClient implementation.
-  virtual void OnProcessCrashed(int exit_code) override;
-  virtual bool OnMessageReceived(const IPC::Message& message) override;
+  void OnProcessCrashed(int exit_code) override;
+  bool OnMessageReceived(const IPC::Message& message) override;
 
   State state_;
 
   base::File file_;
 
   const storage::CopyOrMoveFileValidator::ResultCallback callback_;
 
   base::WeakPtr<content::UtilityProcessHost> utility_process_host_;
 
   DISALLOW_COPY_AND_ASSIGN(SafeAudioVideoChecker);
 };
 
 #endif  // CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_SAFE_AUDIO_VIDEO_CHECKER_H_