Standardize usage of virtual/override/final in media/

media/formats/webm/webm_audio_client.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_FORMATS_WEBM_WEBM_AUDIO_CLIENT_H_
 #define MEDIA_FORMATS_WEBM_WEBM_AUDIO_CLIENT_H_
 
 #include <string>
 #include <vector>
 
 #include "media/base/media_log.h"
 #include "media/formats/webm/webm_parser.h"
 
 namespace media {
 class AudioDecoderConfig;
 
 // Helper class used to parse an Audio element inside a TrackEntry element.
 class WebMAudioClient : public WebMParserClient {
  public:
   explicit WebMAudioClient(const LogCB& log_cb);
-  virtual ~WebMAudioClient();
+  ~WebMAudioClient() override;
 
   // Reset this object's state so it can process a new audio track element.
   void Reset();
 
   // Initialize |config| with the data in |codec_id|, |codec_private|,
   // |is_encrypted| and the fields parsed from the last audio track element this
   // object was used to parse.
   // Returns true if |config| was successfully initialized.
   // Returns false if there was unexpected values in the provided parameters or
   // audio track element fields.
   bool InitializeConfig(const std::string& codec_id,
                         const std::vector<uint8>& codec_private,
                         const int64 seek_preroll,
                         const int64 codec_delay,
                         bool is_encrypted,
                         AudioDecoderConfig* config);
 
  private:
   // WebMParserClient implementation.
-  virtual bool OnUInt(int id, int64 val) override;
-  virtual bool OnFloat(int id, double val) override;
+  bool OnUInt(int id, int64 val) override;
+  bool OnFloat(int id, double val) override;
 
   LogCB log_cb_;
   int channels_;
   double samples_per_second_;
   double output_samples_per_second_;
 
   DISALLOW_COPY_AND_ASSIGN(WebMAudioClient);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FORMATS_WEBM_WEBM_AUDIO_CLIENT_H_