Standardize usage of virtual/override/final in media/

media/cast/logging/receiver_time_offset_estimator.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MEDIA_CAST_LOGGING_RECEIVER_TIME_OFFSET_ESTIMATOR_H_
 #define MEDIA_CAST_LOGGING_RECEIVER_TIME_OFFSET_ESTIMATOR_H_
 
 #include "base/time/time.h"
 #include "media/cast/logging/raw_event_subscriber.h"
 
 namespace media {
 namespace cast {
 
 // Estimates receiver time offset based on raw events received.
 // In most cases, the sender and receiver run on different time lines.
 // In order to convert receiver time back to sender time (or vice versa)
 // a certain time offset has to be applied.
 // An implementation of this interface listens to raw events to figure out
 // the bounds for the offset value (assuming the true offset value is constant
 // over the lifetime of a cast session).
 // The offset values provided here should be used as follows:
 // - Convert from sender to receiver time: add offset value to sender timestamp.
 // - Convert from receiver to sender time: subtract offset value from receiver
 //   timestamp.
 class ReceiverTimeOffsetEstimator : public RawEventSubscriber {
  public:
-  virtual ~ReceiverTimeOffsetEstimator() {}
+  ~ReceiverTimeOffsetEstimator() override {}
 
   // If bounds are known, assigns |lower_bound| and |upper_bound| with the
   // lower bound and upper bound for the offset value, respectively.
   // Returns true if bounds are known.
   virtual bool GetReceiverOffsetBounds(base::TimeDelta* lower_bound,
                                        base::TimeDelta* upper_bound) = 0;
 };
 
 }  // namespace cast
 }  // namespace media
 
 #endif  // MEDIA_CAST_LOGGING_RECEIVER_TIME_OFFSET_ESTIMATOR_H_