Update pub to use new import syntax.

utils/tests/pub/lock_file_test.dart

Index: utils/tests/pub/lock_file_test.dart
diff --git a/utils/tests/pub/lock_file_test.dart b/utils/tests/pub/lock_file_test.dart
index da334aa3e51f74183292227e6c4dc2ed78c9298c..7b14e499360bb842052b59ffb2d15fa36d3bd09d 100644
--- a/utils/tests/pub/lock_file_test.dart
+++ b/utils/tests/pub/lock_file_test.dart
@@ -2,16 +2,16 @@
 // 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('lock_file_test');
-
-#import('../../../pkg/unittest/unittest.dart');
-#import('../../pub/lock_file.dart');
-#import('../../pub/package.dart');
-#import('../../pub/source.dart');
-#import('../../pub/source_registry.dart');
-#import('../../pub/utils.dart');
-#import('../../pub/version.dart');
-#import('../../pub/yaml/yaml.dart');
+library lock_file_test;
+
+import '../../../pkg/unittest/unittest.dart';
+import '../../pub/lock_file.dart';
+import '../../pub/package.dart';
+import '../../pub/source.dart';
+import '../../pub/source_registry.dart';
+import '../../pub/utils.dart';
+import '../../pub/version.dart';
+import '../../pub/yaml/yaml.dart';
 
 class MockSource extends Source {
   final String name = 'mock';