[sync] Componentize sync: Part 6: Add more SYNC_EXPORTs to files in src/sync/

sync/internal_api/public/base/progress_marker_map.h

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Copyright 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.
 //
 // Definition of ProgressMarkerMap and various utility functions.
 
 #ifndef SYNC_INTERNAL_PUBLIC_API_BASE_PROGRESS_MARKER_MAP_H_
 #define SYNC_INTERNAL_PUBLIC_API_BASE_PROGRESS_MARKER_MAP_H_
 
 #include <map>
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
 #include "sync/base/sync_export.h"
 #include "sync/internal_api/public/base/model_type.h"
 
 // TODO(akalin,mmontgomery): Move the non-exported functions in this file to a
 // private header.
 
 namespace base {
 class DictionaryValue;
 }
 
 namespace syncer {
 
 // A container that maps ModelType to serialized
 // DataTypeProgressMarkers.
 typedef std::map<ModelType, std::string> ProgressMarkerMap;
 
-scoped_ptr<base::DictionaryValue> ProgressMarkerMapToValue(
+SYNC_EXPORT_PRIVATE scoped_ptr<base::DictionaryValue> ProgressMarkerMapToValue(
     const ProgressMarkerMap& marker_map);
 
 }  // namespace syncer
 
 #endif  // SYNC_INTERNAL_PUBLIC_API_BASE_PROGRESS_MARKER_MAP_H_