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

test/get/git/stay_locked_if_compatible_test.dart

Index: test/get/git/stay_locked_if_compatible_test.dart
diff --git a/test/get/git/stay_locked_if_compatible_test.dart b/test/get/git/stay_locked_if_compatible_test.dart
index ab6eb51ec4d86371548b24022999af2c7b55932c..9a30ba8bfe0d0c8f29ae30002808aa90290e0433 100644
--- a/test/get/git/stay_locked_if_compatible_test.dart
+++ b/test/get/git/stay_locked_if_compatible_test.dart
@@ -17,7 +17,9 @@ main() {
 
     d.appDir({"foo": {"git": "../foo.git"}}).create();
 
-    pubGet();
+    // TODO(rnystrom): Remove "--packages-dir" and validate using the
+    // ".packages" file instead of looking in the "packages" directory.
+    pubGet(args: ["--packages-dir"]);
 
     d.dir(packagesPath, [
       d.dir('foo', [
@@ -32,7 +34,9 @@ main() {
 
     d.appDir({"foo": {"git": "../foo.git", "version": ">=1.0.0"}}).create();
 
-    pubGet();
+    // TODO(rnystrom): Remove "--packages-dir" and validate using the
+    // ".packages" file instead of looking in the "packages" directory.
+    pubGet(args: ["--packages-dir"]);
 
     d.dir(packagesPath, [
       d.dir('foo', [