Standardize usage of virtual/override/final in media/

media/cast/logging/receiver_time_offset_estimator_impl.h

Index: media/cast/logging/receiver_time_offset_estimator_impl.h
diff --git a/media/cast/logging/receiver_time_offset_estimator_impl.h b/media/cast/logging/receiver_time_offset_estimator_impl.h
index f39cfa2ab33e121923792793341a2d8f16e8748e..bc5348b90e42df5263b23b7c048d6b266fb371ed 100644
--- a/media/cast/logging/receiver_time_offset_estimator_impl.h
+++ b/media/cast/logging/receiver_time_offset_estimator_impl.h
@@ -36,15 +36,15 @@ class ReceiverTimeOffsetEstimatorImpl : public ReceiverTimeOffsetEstimator {
  public:
   ReceiverTimeOffsetEstimatorImpl();
 
-  virtual ~ReceiverTimeOffsetEstimatorImpl();
+  ~ReceiverTimeOffsetEstimatorImpl() override;
 
   // RawEventSubscriber 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;
 
   // ReceiverTimeOffsetEstimator implementation.
-  virtual bool GetReceiverOffsetBounds(base::TimeDelta* lower_bound,
-                                       base::TimeDelta* upper_bound) override;
+  bool GetReceiverOffsetBounds(base::TimeDelta* lower_bound,
+                               base::TimeDelta* upper_bound) override;
 
  private:
   // This helper uses the difference between sent and recived event