Move base::FreeDeleter into its own header.

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 <stddef.h>
 
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
+#include "base/memory/free_deleter.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/run_loop.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/synchronization/waitable_event.h"
 #include "components/storage_monitor/mock_removable_storage_observer.h"
 #include "components/storage_monitor/portable_device_watcher_win.h"
 #include "components/storage_monitor/removable_device_constants.h"
 #include "components/storage_monitor/storage_info.h"
 #include "components/storage_monitor/storage_monitor_win.h"
@@ skipping 518 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