Update pub to use new import syntax.

utils/tests/pub/update/hosted/unlock_if_necessary_test.dart

Index: utils/tests/pub/update/hosted/unlock_if_necessary_test.dart
diff --git a/utils/tests/pub/update/hosted/unlock_if_necessary_test.dart b/utils/tests/pub/update/hosted/unlock_if_necessary_test.dart
index 243d3b5037d64aedcfc3dc4734878ca49e90a9ef..ab43ad5bda792dc10628f4736ead99653dad1e7e 100644
--- a/utils/tests/pub/update/hosted/unlock_if_necessary_test.dart
+++ b/utils/tests/pub/update/hosted/unlock_if_necessary_test.dart
@@ -2,12 +2,12 @@
 // 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('pub_tests');
+library pub_tests;
 
-#import('dart:io');
+import 'dart:io';
 
-#import('../../test_pub.dart');
-#import('../../../../../pkg/unittest/unittest.dart');
+import '../../test_pub.dart';
+import '../../../../../pkg/unittest/unittest.dart';
 
 main() {
   test("updates one locked pub server package's dependencies if it's "