Standardize usage of virtual/override/final specifiers.

media/audio/alsa/alsa_input.h

 // Copyright 2013 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_AUDIO_ALSA_ALSA_INPUT_H_
 #define MEDIA_AUDIO_ALSA_ALSA_INPUT_H_
 
 #include <alsa/asoundlib.h>
 
 #include <string>
@@ skipping 21 matching lines @@
   static const char kAutoSelectDevice[];
 
   // Create a PCM Output stream for the ALSA device identified by
   // |device_name|. If unsure of what to use for |device_name|, use
   // |kAutoSelectDevice|.
   AlsaPcmInputStream(AudioManagerBase* audio_manager,
                      const std::string& device_name,
                      const AudioParameters& params,
                      AlsaWrapper* wrapper);
 
-  virtual ~AlsaPcmInputStream();
+  ~AlsaPcmInputStream() override;
 
   // Implementation of AudioInputStream.
-  virtual bool Open() override;
-  virtual void Start(AudioInputCallback* callback) override;
-  virtual void Stop() override;
-  virtual void Close() override;
-  virtual double GetMaxVolume() override;
-  virtual void SetVolume(double volume) override;
-  virtual double GetVolume() override;
-  virtual bool IsMuted() override;
+  bool Open() override;
+  void Start(AudioInputCallback* callback) override;
+  void Stop() override;
+  void Close() override;
+  double GetMaxVolume() override;
+  void SetVolume(double volume) override;
+  double GetVolume() override;
+  bool IsMuted() override;
 
  private:
   // Logs the error and invokes any registered callbacks.
   void HandleError(const char* method, int error);
 
   // Reads one or more buffers of audio from the device, passes on to the
   // registered callback and schedules the next read.
   void ReadAudio();
 
   // Recovers from any device errors if possible.
@@ skipping 24 matching lines @@
 
   // NOTE: Weak pointers must be invalidated before all other member variables.
   base::WeakPtrFactory<AlsaPcmInputStream> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AlsaPcmInputStream);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_ALSA_ALSA_INPUT_H_