[NaCl SDK] Refactor STATUSCODE_*

native_client_sdk/src/libraries/nacl_io/http_status_codes.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 LIBRARIES_NACL_IO_HTTP_STATUS_CODES_H_
+#define LIBRARIES_NACL_IO_HTTP_STATUS_CODES_H_
+
+namespace nacl_io {
+
+const int32_t STATUSCODE_OK = 200;
+const int32_t STATUSCODE_PARTIAL_CONTENT = 206;
+const int32_t STATUSCODE_FORBIDDEN = 403;
+const int32_t STATUSCODE_NOT_FOUND = 404;
+const int32_t STATUSCODE_REQUESTED_RANGE_NOT_SATISFIABLE = 416;
+
+}  // namespace nacl_io
+
+#endif  // LIBRARIES_NACL_IO_HTTP_STATUS_CODES_H_