Update {virtual,override,final} for components/ to follow C++11 style.

components/storage_monitor/storage_monitor_mac_unittest.mm

 // 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 "components/storage_monitor/storage_monitor_mac.h"
 
 #include "base/bind_helpers.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/mac/foundation_util.h"
@@ skipping 23 matching lines @@
       device_id, mount_point.value(), base::string16(), base::string16(),
       base::UTF8ToUTF16(model_name), size_bytes);
 }
 
 }  // namespace
 
 class StorageMonitorMacTest : public testing::Test {
  public:
   StorageMonitorMacTest() {}
 
-  virtual void SetUp() override {
+  void SetUp() override {
     monitor_.reset(new StorageMonitorMac);
 
     mock_storage_observer_.reset(new MockRemovableStorageObserver);
     monitor_->AddObserver(mock_storage_observer_.get());
 
     unique_id_ = "test_id";
     mount_point_ = base::FilePath("/unused_test_directory");
     device_id_ = StorageInfo::MakeDeviceId(
         StorageInfo::REMOVABLE_MASS_STORAGE_NO_DCIM, unique_id_);
     disk_info_ = CreateStorageInfo(device_id_, "",
@@ skipping 106 matching lines @@
 
 // Test that mounting a DMG doesn't send a notification.
 TEST_F(StorageMonitorMacTest, DMG) {
   StorageInfo info = CreateStorageInfo(
       device_id_, "Disk Image", mount_point_, kTestSize);
   UpdateDisk(info, StorageMonitorMac::UPDATE_DEVICE_ADDED);
   EXPECT_EQ(0, mock_storage_observer_->attach_calls());
 }
 
 }  // namespace storage_monitor