Remove stl_util's deletion functions from chromeos/.

chromeos/settings/timezone_settings_helper.h

 // Copyright 2015 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 CHROMEOS_SETTINGS_TIMEZONE_SETTINGS_HELPER_H_
 #define CHROMEOS_SETTINGS_TIMEZONE_SETTINGS_HELPER_H_
 
+#include <memory>
 #include <vector>
 
 #include "third_party/icu/source/i18n/unicode/timezone.h"
 
 namespace chromeos {
 namespace system {
 
 // Return a timezone in the list matching |timezone| in terms of
 // id and canonical id. If both fail, return a timezone with
 // the same rules. Otherwise, return null.
 const icu::TimeZone* GetKnownTimezoneOrNull(
     const icu::TimeZone& timezone,
-    const std::vector<icu::TimeZone*>& timezone_list);
+    const std::vector<std::unique_ptr<icu::TimeZone>>& timezone_list);
 
 }  // namespace system
 }  // namespace chromeos
 
 #endif  // CHROMEOS_SETTINGS_TIMEZONE_SETTINGS_HELPER_H_