Move pub into sdk/lib/_internal.

utils/tests/pub/install/hosted/stay_locked_if_compatible_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 'dart:io';
-
-import '../../descriptor.dart' as d;
-import '../../test_pub.dart';
-
-main() {
-  initConfig();
-  integration("doesn't update a locked pub server package with a new "
-      "compatible constraint", () {
-    servePackages([packageMap("foo", "1.0.0")]);
-
-    d.appDir([dependencyMap("foo")]).create();
-
-    schedulePub(args: ['install'],
-        output: new RegExp(r"Dependencies installed!$"));
-
-    d.packagesDir({"foo": "1.0.0"}).validate();
-
-    servePackages([packageMap("foo", "1.0.1")]);
-
-    d.appDir([dependencyMap("foo", ">=1.0.0")]).create();
-
-    schedulePub(args: ['install'],
-        output: new RegExp(r"Dependencies installed!$"));
-
-    d.packagesDir({"foo": "1.0.0"}).validate();
-  });
-}