Revert "[dart:io] Adds Platform.localeName"

runtime/bin/platform.cc

 // 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.
 
 #if !defined(DART_IO_DISABLED)
 
 #include "bin/platform.h"
 
 #include "bin/file.h"
 #include "bin/utils.h"
@@ skipping 91 matching lines @@
     }
     Dart_SetReturnValue(args, result);
   }
 }
 
 
 void FUNCTION_NAME(Platform_GetVersion)(Dart_NativeArguments args) {
   Dart_SetReturnValue(args, Dart_NewStringFromCString(Dart_VersionString()));
 }
 
-
-void FUNCTION_NAME(Platform_LocaleName)(Dart_NativeArguments args) {
-  const char* locale = Platform::LocaleName();
-  if (locale == NULL) {
-    Dart_SetReturnValue(args, DartUtils::NewDartOSError());
-  } else {
-    Dart_SetReturnValue(args, Dart_NewStringFromCString(locale));
-  }
-}
-
 }  // namespace bin
 }  // namespace dart
 
 #endif  // !defined(DART_IO_DISABLED)