Update pub to new getter syntax.

utils/tests/pub/test_pub.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.
 
 /**
  * Test infrastructure for testing pub. Unlike typical unit tests, most pub
  * tests are integration tests that stage some stuff on the file system, run
  * pub, and then validate the results. This library provides an API to build
  * tests like that.
  */
@@ skipping 438 matching lines @@
 
   /**
    * Schedules the directory to be validated after Pub is run with [runPub]. The
    * directory will be validated relative to the sandbox directory.
    */
   void scheduleValidate() => _schedule((parentDir) => validate(parentDir.path));
 
   /**
    * Asserts that the name of the descriptor is a [String] and returns it.
    */
-  String get _stringName() {
+  String get _stringName {
     if (name is String) return name;
     throw 'Pattern $name must be a string.';
   }
 
   /**
    * Validates that at least one file in [dir] matching [name] is valid
    * according to [validate]. [validate] should complete to an exception if the
    * input path is invalid.
    */
   Future _validateOneMatch(String dir, Future validate(String path)) {
@@ skipping 342 matching lines @@
 }
 
 /**
  * Schedules a callback to be called after Pub is run with [runPub], even if it
  * fails.
  */
 void _scheduleCleanup(_ScheduledEvent event) {
   if (_scheduledCleanup == null) _scheduledCleanup = [];
   _scheduledCleanup.add(event);
 }