Standardize usage of virtual/override/final in media/

media/filters/video_frame_scheduler_impl.h

Index: media/filters/video_frame_scheduler_impl.h
diff --git a/media/filters/video_frame_scheduler_impl.h b/media/filters/video_frame_scheduler_impl.h
index e2c0a9d43c8e7949e678284536856951a9337572..6398969f2c063027a994cb0ebe5d4eae40abd97c 100644
--- a/media/filters/video_frame_scheduler_impl.h
+++ b/media/filters/video_frame_scheduler_impl.h
@@ -31,13 +31,13 @@ class MEDIA_EXPORT VideoFrameSchedulerImpl : public VideoFrameScheduler {
   VideoFrameSchedulerImpl(
       const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
       const DisplayCB& display_cb);
-  virtual ~VideoFrameSchedulerImpl();
+  ~VideoFrameSchedulerImpl() override;
 
   // VideoFrameScheduler implementation.
-  virtual void ScheduleVideoFrame(const scoped_refptr<VideoFrame>& frame,
-                                  base::TimeTicks wall_ticks,
-                                  const DoneCB& done_cb) override;
-  virtual void Reset() override;
+  void ScheduleVideoFrame(const scoped_refptr<VideoFrame>& frame,
+                          base::TimeTicks wall_ticks,
+                          const DoneCB& done_cb) override;
+  void Reset() override;
 
   void SetTickClockForTesting(scoped_ptr<base::TickClock> tick_clock);