Start pulling pub from its own repo.

sdk/lib/_internal/pub/test/get/hosted/get_transitive_test.dart

-// Copyright (c) 2012, 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.
-
-library pub_tests;
-
-import '../../descriptor.dart' as d;
-import '../../test_pub.dart';
-
-main() {
-  initConfig();
-  integration('gets packages transitively from a pub server', () {
-    servePackages((builder) {
-      builder.serve("foo", "1.2.3", deps: {"bar": "2.0.4"});
-      builder.serve("bar", "2.0.3");
-      builder.serve("bar", "2.0.4");
-      builder.serve("bar", "2.0.5");
-    });
-
-    d.appDir({"foo": "1.2.3"}).create();
-
-    pubGet();
-
-    d.cacheDir({"foo": "1.2.3", "bar": "2.0.4"}).validate();
-    d.packagesDir({"foo": "1.2.3", "bar": "2.0.4"}).validate();
-  });
-}