Remove stl_util from sync.

components/sync/syncable/syncable-inl.h

-// Copyright (c) 2012 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 COMPONENTS_SYNC_SYNCABLE_SYNCABLE_INL_H_
-#define COMPONENTS_SYNC_SYNCABLE_SYNCABLE_INL_H_
-
-#include "components/sync/syncable/entry_kernel.h"
-
-namespace syncer {
-namespace syncable {
-
-template <typename FieldType, FieldType field_index>
-class LessField {
- public:
-  inline bool operator()(const syncable::EntryKernel* a,
-                         const syncable::EntryKernel* b) const {
-    return a->ref(field_index) < b->ref(field_index);
-  }
-};
-
-}  // namespace syncable
-}  // namespace syncer
-
-#endif  // COMPONENTS_SYNC_SYNCABLE_SYNCABLE_INL_H_