Standardize usage of virtual/override/final in media/

media/formats/mpeg/mpeg_audio_stream_parser_base.h

Index: media/formats/mpeg/mpeg_audio_stream_parser_base.h
diff --git a/media/formats/mpeg/mpeg_audio_stream_parser_base.h b/media/formats/mpeg/mpeg_audio_stream_parser_base.h
index fde850a6f33799a25c96a74ccf089a808c032fba..fc736c2bb85c1c4bdefb1d65a49275ad8a2a2d34 100644
--- a/media/formats/mpeg/mpeg_audio_stream_parser_base.h
+++ b/media/formats/mpeg/mpeg_audio_stream_parser_base.h
@@ -28,19 +28,19 @@ class MEDIA_EXPORT MPEGAudioStreamParserBase : public StreamParser {
   MPEGAudioStreamParserBase(uint32 start_code_mask,
                             AudioCodec audio_codec,
                             int codec_delay);
-  virtual ~MPEGAudioStreamParserBase();
+  ~MPEGAudioStreamParserBase() override;
 
   // StreamParser implementation.
-  virtual void Init(const InitCB& init_cb,
-                    const NewConfigCB& config_cb,
-                    const NewBuffersCB& new_buffers_cb,
-                    bool ignore_text_tracks,
-                    const NeedKeyCB& need_key_cb,
-                    const NewMediaSegmentCB& new_segment_cb,
-                    const base::Closure& end_of_segment_cb,
-                    const LogCB& log_cb) override;
-  virtual void Flush() override;
-  virtual bool Parse(const uint8* buf, int size) override;
+  void Init(const InitCB& init_cb,
+            const NewConfigCB& config_cb,
+            const NewBuffersCB& new_buffers_cb,
+            bool ignore_text_tracks,
+            const NeedKeyCB& need_key_cb,
+            const NewMediaSegmentCB& new_segment_cb,
+            const base::Closure& end_of_segment_cb,
+            const LogCB& log_cb) override;
+  void Flush() override;
+  bool Parse(const uint8* buf, int size) override;
 
  protected:
   // Subclasses implement this method to parse format specific frame headers.