Move pub into sdk/lib/_internal.

utils/tests/pub/install/path/absolute_path_test.dart

-// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS d.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 d.file.
-
-import 'package:pathos/path.dart' as path;
-import 'package:scheduled_test/scheduled_test.dart';
-
-import '../../../../pub/io.dart';
-import '../../descriptor.dart' as d;
-import '../../test_pub.dart';
-
-main() {
-  initConfig();
-  integration('path dependency with absolute path', () {
-    d.dir('foo', [
-      d.libDir('foo'),
-      d.libPubspec('foo', '0.0.1')
-    ]).create();
-
-    d.dir(appPath, [
-      d.pubspec({
-        "name": "myapp",
-        "dependencies": {
-          "foo": {"path": path.join(sandboxDir, "foo")}
-        }
-      })
-    ]).create();
-
-    schedulePub(args: ["install"],
-        output: new RegExp(r"Dependencies installed!$"));
-
-    d.dir(packagesPath, [
-      d.dir("foo", [
-        d.file("foo.dart", 'main() => "foo";')
-      ])
-    ]).validate();
-
-    // Move the packages directory and ensure the symlink still works. That
-    // will validate that we actually created an absolute symlink.
-    d.dir("moved").create();
-    scheduleRename(packagesPath, "moved/packages");
-
-    d.dir("moved/packages", [
-      d.dir("foo", [
-        d.file("foo.dart", 'main() => "foo";')
-      ])
-    ]).validate();
-  });
-}