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

components/storage_monitor/storage_monitor_win_unittest.cc

 // 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.
 
 #include <windows.h>
 #include <dbt.h>
 
 #include <string>
 #include <vector>
 
@@ skipping 21 matching lines @@
 
 typedef std::vector<int> DeviceIndices;
 
 // StorageMonitorWinTest -------------------------------------------------------
 
 namespace storage_monitor {
 
 class StorageMonitorWinTest : public testing::Test {
  public:
   StorageMonitorWinTest();
-  virtual ~StorageMonitorWinTest();
+  ~StorageMonitorWinTest() override;
 
  protected:
   // testing::Test:
-  virtual void SetUp() override;
-  virtual void TearDown() override;
+  void SetUp() override;
+  void TearDown() override;
 
   void PreAttachDevices();
 
   // Runs all the pending tasks on UI thread, FILE thread and blocking thread.
   void RunUntilIdle();
 
   void DoMassStorageDeviceAttachedTest(const DeviceIndices& device_indices);
   void DoMassStorageDevicesDetachedTest(const DeviceIndices& device_indices);
 
   // Injects a device attach or detach change (depending on the value of
@@ skipping 481 matching lines @@
         TestPortableDeviceWatcherWin::kMTPDeviceWithValidInfo);
     EXPECT_EQ(expected, pnp_device_id);
     EXPECT_EQ(it->object_persistent_id,
               TestPortableDeviceWatcherWin::GetMTPStorageUniqueId(
                   pnp_device_id, storage_object_id));
   }
   DoMTPDeviceTest(TestPortableDeviceWatcherWin::kMTPDeviceWithValidInfo, false);
 }
 
 }  // namespace storage_monitor