Standardize usage of virtual/override/final in chrome/browser/media_galleries

chrome/browser/media_galleries/mac/mtp_device_delegate_impl_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 "chrome/browser/media_galleries/mac/mtp_device_delegate_impl_mac.h"
 
 #include <algorithm>
 
 #include "base/mac/scoped_nsobject.h"
 #include "base/threading/sequenced_worker_pool.h"
@@ skipping 20 matching lines @@
 // with the ImageCapture library. It will forward callbacks to
 // its delegate on the task runner with which it is created. All
 // interactions with it are done on the UI thread, but it may be
 // created/destroyed on another thread.
 class MTPDeviceDelegateImplMac::DeviceListener
     : public storage_monitor::ImageCaptureDeviceListener,
       public base::SupportsWeakPtr<DeviceListener> {
  public:
   DeviceListener(MTPDeviceDelegateImplMac* delegate)
       : delegate_(delegate) {}
-  virtual ~DeviceListener() {}
+  ~DeviceListener() override {}
 
   void OpenCameraSession(const std::string& device_id);
   void CloseCameraSessionAndDelete();
 
   void DownloadFile(const std::string& name, const base::FilePath& local_path);
 
   // ImageCaptureDeviceListener
-  virtual void ItemAdded(const std::string& name,
-                         const base::File::Info& info) override;
-  virtual void NoMoreItems() override;
-  virtual void DownloadedFile(const std::string& name,
-                              base::File::Error error) override;
-  virtual void DeviceRemoved() override;
+  void ItemAdded(const std::string& name,
+                 const base::File::Info& info) override;
+  void NoMoreItems() override;
+  void DownloadedFile(const std::string& name,
+                      base::File::Error error) override;
+  void DeviceRemoved() override;
 
   // Used during delegate destruction to ensure there are no more calls
   // to the delegate by the listener.
   virtual void ResetDelegate();
 
  private:
   base::scoped_nsobject<ImageCaptureDevice> camera_device_;
 
   // Weak pointer
   MTPDeviceDelegateImplMac* delegate_;
@@ skipping 419 matching lines @@
   std::string device_name = base::FilePath(device_location).BaseName().value();
   std::string device_id;
   storage_monitor::StorageInfo::Type type;
   bool cracked = storage_monitor::StorageInfo::CrackDeviceId(
       device_name, &type, &device_id);
   DCHECK(cracked);
   DCHECK_EQ(storage_monitor::StorageInfo::MAC_IMAGE_CAPTURE, type);
 
   cb.Run(new MTPDeviceDelegateImplMac(device_id, device_location));
 }