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

chrome/browser/media_galleries/fileapi/supported_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_SUPPORTED_AUDIO_VIDEO_CHECKER_H_
 #define CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_SUPPORTED_AUDIO_VIDEO_CHECKER_H_
 
 #include "base/basictypes.h"
 #include "base/files/file.h"
 #include "base/files/file_path.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/media_galleries/fileapi/av_scanning_file_validator.h"
 
 class MediaFileValidatorFactory;
 class SafeAudioVideoChecker;
 
 // Uses SafeAudioVideoChecker to validate supported audio and video files in
 // the utility process and then uses AVScanningFileValidator to ask the OS to
 // virus scan them. The entire file is not decoded so a positive result from
 // this class does not make the file safe to use in the browser process.
 class SupportedAudioVideoChecker : public AVScanningFileValidator {
  public:
-  virtual ~SupportedAudioVideoChecker();
+  ~SupportedAudioVideoChecker() override;
 
   static bool SupportsFileType(const base::FilePath& path);
 
-  virtual void StartPreWriteValidation(
-      const ResultCallback& result_callback) override;
+  void StartPreWriteValidation(const ResultCallback& result_callback) override;
 
  private:
   friend class MediaFileValidatorFactory;
 
   explicit SupportedAudioVideoChecker(const base::FilePath& file);
 
   void OnFileOpen(base::File file);
 
   base::FilePath path_;
   storage::CopyOrMoveFileValidator::ResultCallback callback_;
   scoped_refptr<SafeAudioVideoChecker> safe_checker_;
   base::WeakPtrFactory<SupportedAudioVideoChecker> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SupportedAudioVideoChecker);
 };
 
 #endif  // CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_SUPPORTED_AUDIO_VIDEO_CHECKER_H_