Remove deprecated parts of dart:async.

pkg/polymer/lib/deploy.dart

 // Copyright (c) 2013, 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.
 
 /**
  * **Note**: If you already have a `build.dart` in your application, we
  * recommend to use the `package:polymer/builder.dart` library instead.
 
  * Temporary deploy command used to create a version of the app that can be
  * compiled with dart2js and deployed. Following pub layout conventions, this
@@ skipping 76 matching lines @@
 String _findDirWithFile(String dir, String filename) {
   while (!new File(path.join(dir, filename)).existsSync()) {
     var parentDir = path.dirname(dir);
     // If we reached root and failed to find it, bail.
     if (parentDir == dir) return null;
     dir = parentDir;
   }
   return dir;
 }
 
-void _reportErrorAndExit(e) {
-  var trace = getAttachedStackTrace(e);
+void _reportErrorAndExit(e, trace) {
   print('Uncaught error: $e');
   if (trace != null) print(trace);
   exit(1);
 }
 
 ArgResults _parseArgs(arguments) {
   var parser = new ArgParser()
       ..addFlag('help', abbr: 'h', help: 'Displays this help message.',
           defaultsTo: false, negatable: false)
       ..addOption('out', abbr: 'o', help: 'Directory to generate files into.',
@@ skipping 20 matching lines @@
     _showUsage(parser);
     return null;
   }
 }
 
 _showUsage(parser) {
   print('Usage: dart --package-root=packages/ '
       'package:polymer/deploy.dart [options]');
   print(parser.getUsage());
 }