Use appPubspec() in more places.

sdk/lib/_internal/pub/test/dev_dependency_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS 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 file.
 
 import 'package:path/path.dart' as path;
 
 import 'descriptor.dart' as d;
 import 'test_pub.dart';
 
 main() {
@@ skipping 76 matching lines @@
         }
       })
     ]).create();
 
     d.dir('bar', [
       d.libDir('bar'),
       d.libPubspec('bar', '0.0.1')
     ]).create();
 
     d.dir(appPath, [
-      d.pubspec({
-        "name": "myapp",
-        "dependencies": {
-          "foo": {"path": "../foo"}
-        }
+      d.appPubspec({
+        "foo": {"path": "../foo"}
       })
     ]).create();
 
     pubInstall();
 
     d.dir(packagesPath, [
       d.dir("foo", [
         d.file("foo.dart", 'main() => "foo";')
       ]),
       d.nothing("bar")
     ]).validate();
   });
 }