[Sync] Move the last things out of core/.

components/sync/core/data_type_association_stats.cc

-// 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.
-
-#include "components/sync/core/data_type_association_stats.h"
-
-namespace syncer {
-
-DataTypeAssociationStats::DataTypeAssociationStats()
-    : num_local_items_before_association(0),
-      num_sync_items_before_association(0),
-      num_local_items_after_association(0),
-      num_sync_items_after_association(0),
-      num_local_items_added(0),
-      num_local_items_deleted(0),
-      num_local_items_modified(0),
-      num_sync_items_added(0),
-      num_sync_items_deleted(0),
-      num_sync_items_modified(0),
-      local_version_pre_association(0),
-      sync_version_pre_association(0),
-      had_error(false) {}
-
-DataTypeAssociationStats::DataTypeAssociationStats(
-    const DataTypeAssociationStats& other) = default;
-
-DataTypeAssociationStats::~DataTypeAssociationStats() {}
-
-}  // namespace syncer