Standardize usage of virtual/override/final in media/

media/formats/webm/webm_info_parser.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_INFO_PARSER_H_
 #define MEDIA_FORMATS_WEBM_WEBM_INFO_PARSER_H_
 
 #include "base/compiler_specific.h"
 #include "base/time/time.h"
 #include "media/base/media_export.h"
 #include "media/formats/webm/webm_parser.h"
 
 namespace media {
 
 // Parser for WebM Info element.
 class MEDIA_EXPORT WebMInfoParser : public WebMParserClient {
  public:
   WebMInfoParser();
-  virtual ~WebMInfoParser();
+  ~WebMInfoParser() override;
 
   // Parses a WebM Info element in |buf|.
   //
   // Returns -1 if the parse fails.
   // Returns 0 if more data is needed.
   // Returns the number of bytes parsed on success.
   int Parse(const uint8* buf, int size);
 
   int64 timecode_scale() const { return timecode_scale_; }
   double duration() const { return duration_; }
   base::Time date_utc() const { return date_utc_; }
 
  private:
   // WebMParserClient methods
-  virtual WebMParserClient* OnListStart(int id) override;
-  virtual bool OnListEnd(int id) override;
-  virtual bool OnUInt(int id, int64 val) override;
-  virtual bool OnFloat(int id, double val) override;
-  virtual bool OnBinary(int id, const uint8* data, int size) override;
-  virtual bool OnString(int id, const std::string& str) override;
+  WebMParserClient* OnListStart(int id) override;
+  bool OnListEnd(int id) override;
+  bool OnUInt(int id, int64 val) override;
+  bool OnFloat(int id, double val) override;
+  bool OnBinary(int id, const uint8* data, int size) override;
+  bool OnString(int id, const std::string& str) override;
 
   int64 timecode_scale_;
   double duration_;
   base::Time date_utc_;
 
   DISALLOW_COPY_AND_ASSIGN(WebMInfoParser);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FORMATS_WEBM_WEBM_INFO_PARSER_H_