Use FormatMessageW for Windows error messages to handle internationalized messages correctly.

runtime/bin/utils.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_UTILS_H_
 #define BIN_UTILS_H_
 
 #include <stdlib.h>
 #include <string.h>
 
@@ skipping 41 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(OSError);
 };
 
 class StringUtils {
  public:
   // The following methods convert the argument if needed.  The
   // conversions are only needed on Windows. If the methods returns a
   // pointer that is different from the input pointer the returned
   // pointer is allocated with malloc and should be freed using free.
-  static const char* SystemStringToUtf8(const char* str);
-  static char* SystemStringToUtf8(char* str);
-  static const char* Utf8ToSystemString(const char* utf8);
-  static char* Utf8ToSystemString(char* utf8);
+  static const char* ConsoleStringToUtf8(const char* str);
+  static char* ConsoleStringToUtf8(char* str);
+  static const char* Utf8ToConsoleString(const char* utf8);
+  static char* Utf8ToConsoleString(char* utf8);
+  static char* WideToUtf8(wchar_t* wide);
+  static const char* WideToUtf8(const wchar_t* wide);
+  static wchar_t* Utf8ToWide(char* utf8);
+  static const wchar_t* Utf8ToWide(const char* utf8);
 };
 
 #endif  // BIN_UTILS_H_