Standardize usage of virtual/override/final in content/browser/

content/browser/device_monitor_mac.mm

 // 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 "content/browser/device_monitor_mac.h"
 
 #import <QTKit/QTKit.h>
 
 #include <set>
 
@@ skipping 118 matching lines @@
 
   if (video_device_added || video_device_removed)
     monitor_->NotifyDeviceChanged(base::SystemMonitor::DEVTYPE_VIDEO_CAPTURE);
   if (audio_device_added || audio_device_removed)
     monitor_->NotifyDeviceChanged(base::SystemMonitor::DEVTYPE_AUDIO_CAPTURE);
 }
 
 class QTKitMonitorImpl : public DeviceMonitorMacImpl {
  public:
   explicit QTKitMonitorImpl(content::DeviceMonitorMac* monitor);
-  virtual ~QTKitMonitorImpl();
+  ~QTKitMonitorImpl() override;
 
-  virtual void OnDeviceChanged() override;
+  void OnDeviceChanged() override;
+
  private:
   void CountDevices();
   void OnAttributeChanged(NSNotification* notification);
 
   id device_change_;
 };
 
 QTKitMonitorImpl::QTKitMonitorImpl(content::DeviceMonitorMac* monitor)
     : DeviceMonitorMacImpl(monitor) {
   NSNotificationCenter* nc = [NSNotificationCenter defaultCenter];
@@ skipping 218 matching lines @@
 
 // AVFoundation implementation of the Mac Device Monitor, registers as a global
 // device connect/disconnect observer and plugs suspend/wake up device observers
 // per device. This class is created and lives in UI thread. Owns a
 // SuspendObserverDelegate that notifies when a device is suspended/resumed.
 class AVFoundationMonitorImpl : public DeviceMonitorMacImpl {
  public:
   AVFoundationMonitorImpl(
       content::DeviceMonitorMac* monitor,
       const scoped_refptr<base::SingleThreadTaskRunner>& device_task_runner);
-  virtual ~AVFoundationMonitorImpl();
+  ~AVFoundationMonitorImpl() override;
 
-  virtual void OnDeviceChanged() override;
+  void OnDeviceChanged() override;
 
  private:
   // {Video,AudioInput}DeviceManager's "Device" thread task runner used for
   // posting tasks to |suspend_observer_delegate_|; valid after
   // MediaStreamManager calls StartMonitoring().
   const scoped_refptr<base::SingleThreadTaskRunner> device_task_runner_;
 
   scoped_refptr<SuspendObserverDelegate> suspend_observer_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(AVFoundationMonitorImpl);
@@ skipping 143 matching lines @@
 }
 
 void DeviceMonitorMac::NotifyDeviceChanged(
     base::SystemMonitor::DeviceType type) {
   DCHECK(thread_checker_.CalledOnValidThread());
   // TODO(xians): Remove the global variable for SystemMonitor.
   base::SystemMonitor::Get()->ProcessDevicesChanged(type);
 }
 
 }  // namespace content