Remove duplicated code on Windows

runtime/bin/utils_win.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-#ifndef BIN_IO_NATIVES_H_
-#define BIN_IO_NATIVES_H_
+#ifndef BIN_UTILS_WIN_H_
+#define BIN_UTILS_WIN_H_
 
-#include "include/dart_api.h"
-
+#include "platform/globals.h"
 
 namespace dart {
 namespace bin {
 
-Dart_NativeFunction IONativeLookup(Dart_Handle name,
-                                   int argument_count);
+void FormatMessageIntoBuffer(DWORD code, wchar_t* buffer, int buffer_length);
 
 }  // namespace bin
 }  // namespace dart
 
-#endif  // BIN_IO_NATIVES_H_
+#endif  // BIN_UTILS_WIN_H_