Update library syntax in pkg files.

pkg/args/example/test_runner.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 is an example of converting the args in test.dart to use this API.
  * It shows what it looks like to build an [ArgParser] and then, when the code
  * is run, demonstrates what the generated usage text looks like.
  */
-#library('example');
+library example;
 
-#import('dart:io');
+import 'dart:io';
 
-#import('package:args/args.dart');
+import 'package:args/args.dart';
 
 main() {
   var parser = new ArgParser();
 
   parser.addOption('mode', abbr: 'm', defaultsTo: 'debug',
       help: 'Mode in which to run the tests',
       allowed: ['all', 'debug', 'release']);
 
   parser.addOption('compiler', abbr: 'c', defaultsTo: 'none',
       help: 'Specify any compilation step (if needed).',
@@ skipping 93 matching lines @@
   parser.addOption('dart',    help: 'Path to dart executable');
   parser.addOption('drt',     help: 'Path to DumpRenderTree executable');
   parser.addOption('dartium', help: 'Path to Dartium Chrome executable');
 
   parser.addFlag('batch', abbr: 'b',
       help: 'Run browser tests in batch mode',
       defaultsTo: true);
 
   print(parser.getUsage());
 }