[Sync] Moving DataTypeState to proto for serialization

sync/internal_api/public/test/fake_metadata_change_list.h

 // Copyright 2016 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 SYNC_INTERNAL_API_PUBLIC_TEST_FAKE_METADATA_CHANGE_LIST_H_
 #define SYNC_INTERNAL_API_PUBLIC_TEST_FAKE_METADATA_CHANGE_LIST_H_
 
+#include <string>
 #include <vector>
 
 #include "sync/api/metadata_change_list.h"
 #include "sync/internal_api/public/non_blocking_sync_common.h"
+#include "sync/protocol/data_type_state.pb.h"
 #include "sync/protocol/entity_metadata.pb.h"
 
 namespace syncer_v2 {
 
 // A non-functional implementation of MetadataChangeList for
 // testing purposes.
 // This class simply records all calls with all arguments for further
 // analysis by the test code.
 class FakeMetadataChangeList : public MetadataChangeList {
  public:
   FakeMetadataChangeList();
   ~FakeMetadataChangeList() override;
 
-  void UpdateDataTypeState(const DataTypeState& data_type_state) override;
+  void UpdateDataTypeState(
+      const sync_pb::DataTypeState& data_type_state) override;
   void ClearDataTypeState() override;
   void UpdateMetadata(const std::string& client_tag,
                       const sync_pb::EntityMetadata& metadata) override;
   void ClearMetadata(const std::string& client_tag) override;
 
   enum Action {
     UPDATE_DATA_TYPE_STATE,
     CLEAR_DATA_TYPE_STATE,
     UPDATE_METADATA,
     CLEAR_METADATA
   };
 
   struct Record {
     Record();
     virtual ~Record();
 
     Action action;
     std::string tag;
-    DataTypeState data_type_state;
+    sync_pb::DataTypeState data_type_state;
     sync_pb::EntityMetadata metadata;
   };
 
   size_t GetNumRecords() const;
   const Record& GetNthRecord(size_t n) const;
 
  private:
   std::vector<Record> records_;
 };
 
 }  // namespace syncer_v2
 
 #endif  // SYNC_INTERNAL_API_PUBLIC_TEST_FAKE_METADATA_CHANGE_LIST_H_