Revert of Fix a race condition in ~RegistryHashStoreContentsWin

services/preferences/tracked/temp_scoped_dir_cleaner.h

Index: services/preferences/tracked/temp_scoped_dir_cleaner.h
diff --git a/services/preferences/tracked/temp_scoped_dir_cleaner.h b/services/preferences/tracked/temp_scoped_dir_cleaner.h
deleted file mode 100644
index 4359b760bd17be95cc14e1f83ad73294f2de2072..0000000000000000000000000000000000000000
--- a/services/preferences/tracked/temp_scoped_dir_cleaner.h
+++ /dev/null
@@ -1,18 +0,0 @@
-// Copyright 2017 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 SERVICES_PREFERENCES_TRACKED_TEMP_SCOPED_DIR_CLEANER_H_
-#define SERVICES_PREFERENCES_TRACKED_TEMP_SCOPED_DIR_CLEANER_H_
-
-#include "base/memory/ref_counted.h"
-
-// Helper object to clear additional data for scoped temporary pref stores.
-class TempScopedDirCleaner
-    : public base::RefCountedThreadSafe<TempScopedDirCleaner> {
- protected:
-  friend class base::RefCountedThreadSafe<TempScopedDirCleaner>;
-  virtual ~TempScopedDirCleaner(){};
-};
-
-#endif  // SERVICES_PREFERENCES_TRACKED_TEMP_SCOPED_DIR_CLEANER_H_