Deprecate *_EXPORT_PRIVATE macros.

components/invalidation/impl/state_writer.h

 // Copyright 2014 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.
 //
 // Simple interface for something that persists state.
 
 #ifndef COMPONENTS_INVALIDATION_IMPL_STATE_WRITER_H_
 #define COMPONENTS_INVALIDATION_IMPL_STATE_WRITER_H_
 
 #include <string>
 
 #include "components/invalidation/public/invalidation_export.h"
 
 namespace syncer {
 
-class INVALIDATION_EXPORT_PRIVATE StateWriter {
+class INVALIDATION_EXPORT StateWriter {
  public:
   virtual ~StateWriter() {}
 
   virtual void WriteState(const std::string& state) = 0;
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_INVALIDATION_IMPL_STATE_WRITER_H_