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

test/get/path/absolute_path_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS d.file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE d.file.
 
 import 'package:path/path.dart' as path;
 
 import '../../descriptor.dart' as d;
 import '../../test_pub.dart';
 
 main() {
   integration('path dependency with absolute path', () {
     d.dir('foo', [
       d.libDir('foo'),
       d.libPubspec('foo', '0.0.1')
     ]).create();
 
     d.dir(appPath, [
       d.appPubspec({
         "foo": {"path": path.join(sandboxDir, "foo")}
       })
     ]).create();
 
-    pubGet();
+    pubGet(args: ["--packages-dir"]);
 
-    d.dir(packagesPath, [
-      d.dir("foo", [
-        d.file("foo.dart", 'main() => "foo";')
-      ])
-    ]).validate();
-
-    // Move the packages directory and ensure the symlink still works. That
-    // will validate that we actually created an absolute symlink.
-    d.dir("moved").create();
-    scheduleRename(packagesPath, "moved/packages");
-
-    d.dir("moved/packages", [
-      d.dir("foo", [
-        d.file("foo.dart", 'main() => "foo";')
-      ])
-    ]).validate();
+    d.appPackagesFile({
+      "foo": path.join(sandboxDir, "foo")
+    }).validate();
   });
-}
+}