Move pub into sdk/lib/_internal.

utils/tests/pub/lish/upload_form_is_missing_fields_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 'dart:json' as json;
-
-import 'package:scheduled_test/scheduled_test.dart';
-import 'package:scheduled_test/scheduled_server.dart';
-
-import '../descriptor.dart' as d;
-import '../test_pub.dart';
-import 'utils.dart';
-
-main() {
-  initConfig();
-  setUp(d.validPackage.create);
-
-  integration('upload form is missing fields', () {
-    var server = new ScheduledServer();
-    d.credentialsFile(server, 'access token').create();
-    var pub = startPublish(server);
-
-    confirmPublish(pub);
-
-    var body = {'url': 'http://example.com/upload'};
-    handleUploadForm(server, body);
-    expect(pub.nextErrLine(), completion(equals('Invalid server response:')));
-    expect(pub.nextErrLine(), completion(equals(json.stringify(body))));
-    pub.shouldExit(1);
-  });
-}