Update pub to new getter syntax.

utils/pub/command_help.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.
 
 #library('command_help');
 
 #import('pub.dart');
 
 /** Handles the `help` pub command. */
 class HelpCommand extends PubCommand {
-  String get description() =>
-    "display help information for Pub";
-
-  String get usage() => 'pub help [command]';
+  String get description => "display help information for Pub";
+  String get usage => 'pub help [command]';
 
   Future onRun() {
     if (commandOptions.rest.isEmpty()) {
       printUsage();
     } else {
       pubCommands[commandOptions.rest[0]].printUsage();
     }
   }
 }