Update {virtual,override} to follow C++11 style in components.

components/storage_monitor/test_volume_mount_watcher_win.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.
 //
 // This file contains a subclass of VolumeMountWatcherWin to expose some
 // functionality for testing.
 
 #ifndef COMPONENTS_STORAGE_MONITOR_TEST_VOLUME_MOUNT_WATCHER_WIN_H_
 #define COMPONENTS_STORAGE_MONITOR_TEST_VOLUME_MOUNT_WATCHER_WIN_H_
 
 #include <string>
 #include <vector>
 
 #include "base/strings/string16.h"
 #include "base/synchronization/waitable_event.h"
 #include "components/storage_monitor/volume_mount_watcher_win.h"
 
 namespace base {
 class FilePath;
 }
 
 namespace storage_monitor {
 
 class TestVolumeMountWatcherWin : public VolumeMountWatcherWin {
  public:
   TestVolumeMountWatcherWin();
-  virtual ~TestVolumeMountWatcherWin();
+  ~TestVolumeMountWatcherWin() override;
 
   static bool GetDeviceRemovable(const base::FilePath& device_path,
                                  bool* removable);
 
   void AddDeviceForTesting(const base::FilePath& device_path,
                            const std::string& device_id,
                            const base::string16& device_name,
                            uint64 total_size_in_bytes);
 
   void SetAttachedDevicesFake();
 
   void FlushWorkerPoolForTesting();
 
   const std::vector<base::FilePath>& devices_checked() const {
       return devices_checked_;
   }
 
   void BlockDeviceCheckForTesting();
 
   void ReleaseDeviceCheck();
 
   // VolumeMountWatcherWin:
-  virtual void DeviceCheckComplete(const base::FilePath& device_path) override;
-  virtual GetAttachedDevicesCallbackType
-      GetAttachedDevicesCallback() const override;
-  virtual GetDeviceDetailsCallbackType
-      GetDeviceDetailsCallback() const override;
+  void DeviceCheckComplete(const base::FilePath& device_path) override;
+  GetAttachedDevicesCallbackType GetAttachedDevicesCallback() const override;
+  GetDeviceDetailsCallbackType GetDeviceDetailsCallback() const override;
 
  private:
   std::vector<base::FilePath> devices_checked_;
   scoped_ptr<base::WaitableEvent> device_check_complete_event_;
   bool attached_devices_fake_;
 
   DISALLOW_COPY_AND_ASSIGN(TestVolumeMountWatcherWin);
 };
 
 }  // namespace storage_monitor
 
 #endif  // COMPONENTS_STORAGE_MONITOR_TEST_VOLUME_MOUNT_WATCHER_WIN_H_