Make "--no-packages-dir" the default.

test/get/hosted/gets_a_package_with_busted_dev_dependencies_test.dart

Index: test/get/hosted/gets_a_package_with_busted_dev_dependencies_test.dart
diff --git a/test/get/hosted/gets_a_package_with_busted_dev_dependencies_test.dart b/test/get/hosted/gets_a_package_with_busted_dev_dependencies_test.dart
index dbbbf88df730549a83dee95532d01b98d7ecdb9f..3e6e65ae43353f29feb58b633bc6baccfa3587ff 100644
--- a/test/get/hosted/gets_a_package_with_busted_dev_dependencies_test.dart
+++ b/test/get/hosted/gets_a_package_with_busted_dev_dependencies_test.dart
@@ -22,6 +22,6 @@ main() {
     pubGet();
 
     d.cacheDir({"foo": "1.2.3"}).validate();
-    d.packagesDir({"foo": "1.2.3"}).validate();
+    d.appPackagesFile({"foo": "1.2.3"}).validate();
   });
 }