Move pub into sdk/lib/_internal.

utils/tests/pub/install/broken_symlink_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 'package:pathos/path.dart' as path;
-
-import '../descriptor.dart' as d;
-import '../test_pub.dart';
-
-main() {
-  initConfig();
-  integration('replaces a broken "packages" symlink', () {
-    d.dir(appPath, [
-      d.appPubspec([]),
-      d.libDir('foo'),
-      d.dir("bin")
-    ]).create();
-
-    // Create a broken "packages" symlink in "bin".
-    scheduleSymlink("nonexistent", path.join(appPath, "packages"));
-
-    schedulePub(args: ['install'],
-        output: new RegExp(r"Dependencies installed!$"));
-
-    d.dir(appPath, [
-      d.dir("bin", [
-        d.dir("packages", [
-          d.dir("myapp", [
-            d.file('foo.dart', 'main() => "foo";')
-          ])
-        ])
-      ])
-    ]).validate();
-  });
-
-  integration('replaces a broken secondary "packages" symlink', () {
-    d.dir(appPath, [
-      d.appPubspec([]),
-      d.libDir('foo'),
-      d.dir("bin")
-    ]).create();
-
-    // Create a broken "packages" symlink in "bin".
-    scheduleSymlink("nonexistent", path.join(appPath, "bin", "packages"));
-
-    schedulePub(args: ['install'],
-        output: new RegExp(r"Dependencies installed!$"));
-
-    d.dir(appPath, [
-      d.dir("bin", [
-        d.dir("packages", [
-          d.dir("myapp", [
-            d.file('foo.dart', 'main() => "foo";')
-          ])
-        ])
-      ])
-    ]).validate();
-  });
-}