Revert of Move some sync/notifier to components/invalidation

components/invalidation/state_writer.h

Index: components/invalidation/state_writer.h
diff --git a/components/invalidation/state_writer.h b/components/invalidation/state_writer.h
deleted file mode 100644
index 6bcd477130c1e047ba6313323f522508f7ddced6..0000000000000000000000000000000000000000
--- a/components/invalidation/state_writer.h
+++ /dev/null
@@ -1,25 +0,0 @@
-// 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.
-//
-// Simple interface for something that persists state.
-
-#ifndef COMPONENTS_INVALIDATION_STATE_WRITER_H_
-#define COMPONENTS_INVALIDATION_STATE_WRITER_H_
-
-#include <string>
-
-#include "components/invalidation/invalidation_export.h"
-
-namespace syncer {
-
-class INVALIDATION_EXPORT_PRIVATE StateWriter {
- public:
-  virtual ~StateWriter() {}
-
-  virtual void WriteState(const std::string& state) = 0;
-};
-
-}  // namespace syncer
-
-#endif  // COMPONENTS_INVALIDATION_STATE_WRITER_H_