Start pulling pub from its own repo.

sdk/lib/_internal/pub/test/get/git/check_out_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('checks out packages transitively from Git', () {
-    ensureGit();
-
-    d.git('foo.git', [
-      d.libDir('foo'),
-      d.libPubspec('foo', '1.0.0', deps: {
-        "bar": {"git": "../bar.git"}
-      })
-    ]).create();
-
-    d.git('bar.git', [
-      d.libDir('bar'),
-      d.libPubspec('bar', '1.0.0')
-    ]).create();
-
-    d.appDir({"foo": {"git": "../foo.git"}}).create();
-
-    pubGet();
-
-    d.dir(cachePath, [
-      d.dir('git', [
-        d.dir('cache', [
-          d.gitPackageRepoCacheDir('foo'),
-          d.gitPackageRepoCacheDir('bar')
-        ]),
-        d.gitPackageRevisionCacheDir('foo'),
-        d.gitPackageRevisionCacheDir('bar')
-      ])
-    ]).validate();
-
-    d.dir(packagesPath, [
-      d.dir('foo', [
-        d.file('foo.dart', 'main() => "foo";')
-      ]),
-      d.dir('bar', [
-        d.file('bar.dart', 'main() => "bar";')
-      ])
-    ]).validate();
-  });
-}