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

test/get/git/unlock_if_incompatible_test.dart

Index: test/get/git/unlock_if_incompatible_test.dart
diff --git a/test/get/git/unlock_if_incompatible_test.dart b/test/get/git/unlock_if_incompatible_test.dart
index 1e062ab5453e551ce6ff31e5d2514d622fc6f330..76fff867cd2c51b3526f74c68ccc50ed10edf67e 100644
--- a/test/get/git/unlock_if_incompatible_test.dart
+++ b/test/get/git/unlock_if_incompatible_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', [