Fix use of chain in intl library.

pkg/intl/lib/intl_standalone.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.
 
 /**
  * This provides facilities for Internationalization that are only available
  * when running standalone. You should import only one of this or
  * intl_browser.dart. Right now the only thing provided here is finding
  * the operating system locale.
  */
@@ skipping 63 matching lines @@
   } catch (e) {};
   return null;
 }
 
 /**
  * Run the "defaults read -g AppleLocale" command and return the output in
  * a future.
  */
 Future _getAppleDefaults() {
   var p = Process.run('defaults', ['read', '-g', 'AppleLocale']);
-  var myResult = p.chain((result) => _checkResult(result, _appleDefaultsRegex));
+  var myResult = p.then((result) => _checkResult(result, _appleDefaultsRegex));
   return myResult;
 }
 
 /**
  * Run the "systemlocale" command and return the output in a future.
  */
 Future _getWindowsSystemInfo() {
   var p = Process.run('systeminfo', []);
-  var myResult = p.chain((result) => _checkResult(result, _sysInfoRegex));
+  var myResult = p.then((result) => _checkResult(result, _sysInfoRegex));
   return myResult;
 }
 
 /**
  * Given [result], find its text and extract the locale from it using
  * [regex], and set it as the system locale. If the process didn't run correctly
  * then don't set the variable and return a future that completes with null.
  */
 Future<String> _checkResult(ProcessResult result, RegExp regex) {
   if (result.exitCode != 0) return new Future.immediate(null);
   var match = regex.firstMatch(result.stdout);
   if (match == null) return new Future.immediate(null);
   var locale = match.group(1);
   _setLocale(locale);
   return new Future.immediate(locale);
 }
 
 /**
  * Set [Intl.systemLocale] to be the canonicalizedLocale of [aLocale].
  */
 Future<String> _setLocale(aLocale) {
   Intl.systemLocale = Intl.canonicalizedLocale(aLocale);
   return new Future.immediate(Intl.systemLocale);
 }