Standardize usage of virtual/override/final in media/

media/audio/mac/audio_manager_mac.cc

 // Copyright (c) 2012 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.
 
 #include "media/audio/mac/audio_manager_mac.h"
 
 #include <CoreAudio/AudioHardware.h>
 #include <string>
 
 #include "base/bind.h"
@@ skipping 218 matching lines @@
       : is_suspending_(false),
         is_monitoring_(base::PowerMonitor::Get()) {
     // The PowerMonitor requires signifcant setup (a CFRunLoop and preallocated
     // IO ports) so it's not available under unit tests.  See the OSX impl of
     // base::PowerMonitorDeviceSource for more details.
     if (!is_monitoring_)
       return;
     base::PowerMonitor::Get()->AddObserver(this);
   }
 
-  virtual ~AudioPowerObserver() {
+  ~AudioPowerObserver() override {
     DCHECK(thread_checker_.CalledOnValidThread());
     if (!is_monitoring_)
       return;
     base::PowerMonitor::Get()->RemoveObserver(this);
   }
 
   bool ShouldDeferStreamStart() {
     DCHECK(thread_checker_.CalledOnValidThread());
     // Start() should be deferred if the system is in the middle of a suspend or
     // has recently started the process of resuming.
     return is_suspending_ || base::TimeTicks::Now() < earliest_start_time_;
   }
 
  private:
-  virtual void OnSuspend() override {
+  void OnSuspend() override {
     DCHECK(thread_checker_.CalledOnValidThread());
     is_suspending_ = true;
   }
 
-  virtual void OnResume() override {
+  void OnResume() override {
     DCHECK(thread_checker_.CalledOnValidThread());
     is_suspending_ = false;
     earliest_start_time_ = base::TimeTicks::Now() +
         base::TimeDelta::FromSeconds(kStartDelayInSecsForPowerEvents);
   }
 
   bool is_suspending_;
   const bool is_monitoring_;
   base::TimeTicks earliest_start_time_;
   base::ThreadChecker thread_checker_;
@@ skipping 477 matching lines @@
 void AudioManagerMac::ReleaseInputStream(AudioInputStream* stream) {
   input_streams_.remove(stream);
   AudioManagerBase::ReleaseInputStream(stream);
 }
 
 AudioManager* CreateAudioManager(AudioLogFactory* audio_log_factory) {
   return new AudioManagerMac(audio_log_factory);
 }
 
 }  // namespace media