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

sync/engine/apply_control_data_updates.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.
 
 #ifndef SYNC_ENGINE_APPLY_CONTROL_DATA_UPDATES_H_
 #define SYNC_ENGINE_APPLY_CONTROL_DATA_UPDATES_H_
 
+#include "sync/base/sync_export.h"
+
 namespace syncer {
 
 class Cryptographer;
 
 namespace sessions {
 class SyncSession;
 }
 
 namespace syncable {
 class Directory;
 class MutableEntry;
 class WriteTransaction;
 }
 
-void ApplyControlDataUpdates(sessions::SyncSession* session);
+SYNC_EXPORT_PRIVATE void ApplyControlDataUpdates(
+    sessions::SyncSession* session);
 void ApplyNigoriUpdate(syncable::WriteTransaction* trans,
                        syncable::MutableEntry* const entry,
                        Cryptographer* cryptographer);
 void ApplyControlUpdate(syncable::WriteTransaction* const trans,
                         syncable::MutableEntry* const entry,
                         Cryptographer* cryptographer);
 
 }  // namespace syncer
 
 #endif  // SYNC_ENGINE_APPLY_CONTROL_DATA_UPDATES_H_