Use scheduled_test for Pub tests.

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

Index: utils/tests/pub/install/git/require_pubspec_test.dart
diff --git a/utils/tests/pub/install/git/require_pubspec_test.dart b/utils/tests/pub/install/git/require_pubspec_test.dart
index ffc0b60abc234c6935ba9ab4ad27c4a828ce9685..084bbe0def44ba9a52de868d3f59707970e31276 100644
--- a/utils/tests/pub/install/git/require_pubspec_test.dart
+++ b/utils/tests/pub/install/git/require_pubspec_test.dart
@@ -6,17 +6,18 @@ library pub_tests;
 
 import 'dart:io';
 
+import '../../descriptor.dart' as d;
 import '../../test_pub.dart';
 
 main() {
   integration('requires the dependency to have a pubspec', () {
     ensureGit();
 
-    git('foo.git', [
-      libDir('foo')
-    ]).scheduleCreate();
+    d.git('foo.git', [
+      d.libDir('foo')
+    ]).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.