Use scheduled_test for Pub tests.

utils/tests/pub/install/git/require_pubspec_name_test.dart

Index: utils/tests/pub/install/git/require_pubspec_name_test.dart
diff --git a/utils/tests/pub/install/git/require_pubspec_name_test.dart b/utils/tests/pub/install/git/require_pubspec_name_test.dart
index 68cc91ea266356d0cbd79bab7f6d34b7c08c079f..1713e042c8dc86a8f4947ed6b31756e9b87083fc 100644
--- a/utils/tests/pub/install/git/require_pubspec_name_test.dart
+++ b/utils/tests/pub/install/git/require_pubspec_name_test.dart
@@ -6,6 +6,7 @@ library pub_tests;
 
 import 'dart:io';
 
+import '../../descriptor.dart' as d;
 import '../../test_pub.dart';
 
 main() {
@@ -13,12 +14,12 @@ main() {
       'field', () {
     ensureGit();
 
-    git('foo.git', [
-      libDir('foo'),
-      pubspec({})
-    ]).scheduleCreate();
+    d.git('foo.git', [
+      d.libDir('foo'),
+      d.pubspec({})
+    ]).create();
 
-    appDir([{"git": "../foo.git"}]).scheduleCreate();
+    d.appDir([{"git": "../foo.git"}]).create();
 
     // TODO(nweiz): clean up this RegExp when either issue 4706 or 4707 is
     // fixed.