Standardize usage of virtual/override/final in media/

media/filters/decrypting_video_decoder.h

Index: media/filters/decrypting_video_decoder.h
diff --git a/media/filters/decrypting_video_decoder.h b/media/filters/decrypting_video_decoder.h
index 892c429fdf58837dda88223e5b60f61e0bebd6f1..1911c79ab0b6bbcc447085709c631546479fe18c 100644
--- a/media/filters/decrypting_video_decoder.h
+++ b/media/filters/decrypting_video_decoder.h
@@ -29,17 +29,17 @@ class MEDIA_EXPORT DecryptingVideoDecoder : public VideoDecoder {
   DecryptingVideoDecoder(
       const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
       const SetDecryptorReadyCB& set_decryptor_ready_cb);
-  virtual ~DecryptingVideoDecoder();
+  ~DecryptingVideoDecoder() override;
 
   // VideoDecoder implementation.
-  virtual std::string GetDisplayName() const override;
-  virtual void Initialize(const VideoDecoderConfig& config,
-                          bool low_delay,
-                          const PipelineStatusCB& status_cb,
-                          const OutputCB& output_cb) override;
-  virtual void Decode(const scoped_refptr<DecoderBuffer>& buffer,
-                      const DecodeCB& decode_cb) override;
-  virtual void Reset(const base::Closure& closure) override;
+  std::string GetDisplayName() const override;
+  void Initialize(const VideoDecoderConfig& config,
+                  bool low_delay,
+                  const PipelineStatusCB& status_cb,
+                  const OutputCB& output_cb) override;
+  void Decode(const scoped_refptr<DecoderBuffer>& buffer,
+              const DecodeCB& decode_cb) override;
+  void Reset(const base::Closure& closure) override;
 
  private:
   // For a detailed state diagram please see this link: http://goo.gl/8jAok