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

sdk/lib/io/platform.dart

 // 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.
 
 part of dart.io;
 
 /**
  * Information about the environment in which the current program is running.
  *
  * Platform provides information such as the operating system,
@@ skipping 53 matching lines @@
  * [Dart by Example](https://www.dartlang.org/dart-by-example/#dart-io-and-command-line-apps)
  * provides additional task-oriented code samples that show how to use
  * various API from the [dart:io] library.
  */
 class Platform {
   static final _numberOfProcessors = _Platform.numberOfProcessors;
   static final _pathSeparator = _Platform.pathSeparator;
   static final _operatingSystem = _Platform.operatingSystem;
   static final _localHostname = _Platform.localHostname;
   static final _version = _Platform.version;
-  static final _localeName = _Platform.localeName;
 
   /**
    * Get the number of processors of the machine.
    */
   static int get numberOfProcessors => _numberOfProcessors;
 
   /**
    * Get the path separator used by the operating system to separate
    * components in file paths.
    */
   static String get pathSeparator => _pathSeparator;
 
   /**
-   * Get the name of the current locale.
-   */
-  static String get localeName => _localeName;
-
-  /**
    * Get a string (`linux`, `macos`, `windows`, `android`, or `ios`)
    * representing the operating system.
    */
   static String get operatingSystem => _operatingSystem;
 
   /**
    * Get the local hostname for the system.
    */
   static String get localHostname => _localHostname;
 
@@ skipping 109 matching lines @@
   /**
    * Returns the version of the current Dart runtime.
    *
    * The returned `String` is formatted as the
    * [semver](http://semver.org) version string of the current dart
    * runtime, possibly followed by whitespace and other version and
    * build details.
    */
   static String get version => _version;
 }