Move pub into sdk/lib/_internal.

utils/tests/pub/update/git/update_to_incompatible_pubspec_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("updates Git packages to an incompatible pubspec", () {
-    ensureGit();
-
-    d.git('foo.git', [
-      d.libDir('foo'),
-      d.libPubspec('foo', '1.0.0')
-    ]).create();
-
-    d.appDir([{"git": "../foo.git"}]).create();
-
-    schedulePub(args: ['install'],
-        output: new RegExp(r"Dependencies installed!$"));
-
-    d.dir(packagesPath, [
-      d.dir('foo', [
-        d.file('foo.dart', 'main() => "foo";')
-      ])
-    ]).validate();
-
-    d.git('foo.git', [
-      d.libDir('zoo'),
-      d.libPubspec('zoo', '1.0.0')
-    ]).commit();
-
-    schedulePub(args: ['update'],
-        error: new RegExp(r'The name you specified for your dependency, '
-            r'"foo", doesn' "'" r't match the name "zoo" in its pubspec.'),
-        exitCode: 1);
-
-    d.dir(packagesPath, [
-      d.dir('foo', [
-        d.file('foo.dart', 'main() => "foo";')
-      ])
-    ]).validate();
-  });
-}