Standardize usage of virtual/override/final in media/

media/cast/logging/stats_event_subscriber.h

Index: media/cast/logging/stats_event_subscriber.h
diff --git a/media/cast/logging/stats_event_subscriber.h b/media/cast/logging/stats_event_subscriber.h
index d376313a2c114e745d5e5b3e052655af83d5c285..20394021bdc2f5f8ba23806187a504dec1dbaedf 100644
--- a/media/cast/logging/stats_event_subscriber.h
+++ b/media/cast/logging/stats_event_subscriber.h
@@ -32,11 +32,11 @@ class StatsEventSubscriber : public RawEventSubscriber {
                        base::TickClock* clock,
                        ReceiverTimeOffsetEstimator* offset_estimator);
 
-  virtual ~StatsEventSubscriber();
+  ~StatsEventSubscriber() override;
 
   // RawReventSubscriber implementations.
-  virtual void OnReceiveFrameEvent(const FrameEvent& frame_event) override;
-  virtual void OnReceivePacketEvent(const PacketEvent& packet_event) override;
+  void OnReceiveFrameEvent(const FrameEvent& frame_event) override;
+  void OnReceivePacketEvent(const PacketEvent& packet_event) override;
 
   // Returns stats as a DictionaryValue. The dictionary contains one entry -
   // "audio" or "video" pointing to an inner dictionary.