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

test/get/git/locked_revision_without_repo_test.dart

Index: test/get/git/locked_revision_without_repo_test.dart
diff --git a/test/get/git/locked_revision_without_repo_test.dart b/test/get/git/locked_revision_without_repo_test.dart
index 69e918edd9fba4d9a2394e466226fb3157406d5d..dc1ec599a85d1c83f40ce2fe5b2ad5cbc59a55ba 100644
--- a/test/get/git/locked_revision_without_repo_test.dart
+++ b/test/get/git/locked_revision_without_repo_test.dart
@@ -23,7 +23,9 @@ main() {
     d.appDir({"foo": {"git": "../foo.git"}}).create();
 
     // This get should lock the foo.git dependency to the current revision.
-    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', [
@@ -42,7 +44,9 @@ main() {
     ]).commit();
 
     // This get shouldn't upgrade the foo.git dependency due to the lockfile.
-    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', [