Update pub to use the new command runner API in args.

sdk/lib/_internal/pub_generated/test/package_list_files_test.dart

Index: sdk/lib/_internal/pub_generated/test/package_list_files_test.dart
diff --git a/sdk/lib/_internal/pub_generated/test/package_list_files_test.dart b/sdk/lib/_internal/pub_generated/test/package_list_files_test.dart
index d83178953d8260ee5fc5c01a2dfa81194c5fed7c..7d48927b3569efad9e6d6a140345a689b2e655a8 100644
--- a/sdk/lib/_internal/pub_generated/test/package_list_files_test.dart
+++ b/sdk/lib/_internal/pub_generated/test/package_list_files_test.dart
@@ -130,7 +130,8 @@ main() {
 void scheduleEntrypoint() {
   schedule(() {
     root = path.join(sandboxDir, appPath);
-    entrypoint = new Entrypoint(root, new SystemCache.withSources(root));
+    entrypoint =
+        new Entrypoint(root, new SystemCache.withSources(rootDir: root));
   }, 'initializing entrypoint');
 
   currentSchedule.onComplete.schedule(() {