Standardize usage of virtual/override/final in media/

media/formats/mpeg/mpeg1_audio_stream_parser.h

Index: media/formats/mpeg/mpeg1_audio_stream_parser.h
diff --git a/media/formats/mpeg/mpeg1_audio_stream_parser.h b/media/formats/mpeg/mpeg1_audio_stream_parser.h
index 0f33f507c4c6bd4cfb80d0c45615b234aa84c873..b2e5086f8471e8cb28f669271ab19bd65309b38c 100644
--- a/media/formats/mpeg/mpeg1_audio_stream_parser.h
+++ b/media/formats/mpeg/mpeg1_audio_stream_parser.h
@@ -68,17 +68,17 @@ class MEDIA_EXPORT MPEG1AudioStreamParser : public MPEGAudioStreamParserBase {
       Header* header);
 
   MPEG1AudioStreamParser();
-  virtual ~MPEG1AudioStreamParser();
+  ~MPEG1AudioStreamParser() override;
 
  private:
   // MPEGAudioStreamParserBase overrides.
-  virtual int ParseFrameHeader(const uint8* data,
-                               int size,
-                               int* frame_size,
-                               int* sample_rate,
-                               ChannelLayout* channel_layout,
-                               int* sample_count,
-                               bool* metadata_frame) const override;
+  int ParseFrameHeader(const uint8* data,
+                       int size,
+                       int* frame_size,
+                       int* sample_rate,
+                       ChannelLayout* channel_layout,
+                       int* sample_count,
+                       bool* metadata_frame) const override;
 
   DISALLOW_COPY_AND_ASSIGN(MPEG1AudioStreamParser);
 };