[Sync] Not having an autocomplete ModelTypeState is valid.

components/autofill/core/browser/webdata/autofill_table.h

 // Copyright 2013 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_AUTOFILL_CORE_BROWSER_WEBDATA_AUTOFILL_TABLE_H_
 #define COMPONENTS_AUTOFILL_CORE_BROWSER_WEBDATA_AUTOFILL_TABLE_H_
 
 #include <stddef.h>
 
 #include <memory>
+#include <string>
 #include <vector>
 
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/strings/string16.h"
 #include "components/sync/base/model_type.h"
 #include "components/sync/model/metadata_batch.h"
 #include "components/webdata/common/web_database_table.h"
 
 class WebDatabase;
 
 namespace base {
 class Time;
 }
 
-namespace sync_pb {
-class EntityMetadata;
-class ModelTypeState;
-}
-
 namespace autofill {
 
 class AutofillChange;
 class AutofillEntry;
 class AutofillProfile;
 class AutofillTableTest;
 class CreditCard;
 
 struct FormFieldData;
 
@@ skipping 508 matching lines @@
   bool InitServerAddressMetadataTable();
   bool InitAutofillSyncMetadataTable();
   bool InitModelTypeStateTable();
 
   DISALLOW_COPY_AND_ASSIGN(AutofillTable);
 };
 
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_CORE_BROWSER_WEBDATA_AUTOFILL_TABLE_H_