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

components/storage_monitor/test_storage_monitor.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.
 
 #ifndef COMPONENTS_STORAGE_MONITOR_TEST_STORAGE_MONITOR_H_
 #define COMPONENTS_STORAGE_MONITOR_TEST_STORAGE_MONITOR_H_
 
 #include <string>
 
 #include "components/storage_monitor/storage_monitor.h"
@@ skipping 20 matching lines @@
   // convenience. Use |Destroy| to delete the singleton.
   static TestStorageMonitor* CreateForBrowserTests();
 
   // Synchronously initialize the current storage monitor.
   static void SyncInitialize();
 
   bool GetStorageInfoForPath(const base::FilePath& path,
                              StorageInfo* device_info) const override;
 
 #if defined(OS_WIN)
-  virtual bool GetMTPStorageInfoFromDeviceId(
+  bool GetMTPStorageInfoFromDeviceId(
       const std::string& storage_device_id,
       base::string16* device_location,
       base::string16* storage_object_id) const override;
 #endif
 
 #if defined(OS_LINUX)
   device::MediaTransferProtocolManager* media_transfer_protocol_manager()
       override;
 #endif
 
@@ skipping 16 matching lines @@
 
 #if defined(OS_LINUX)
   scoped_ptr<device::MediaTransferProtocolManager>
       media_transfer_protocol_manager_;
 #endif
 };
 
 }  // namespace storage_monitor
 
 #endif  // COMPONENTS_STORAGE_MONITOR_TEST_STORAGE_MONITOR_H_