Start pulling pub from its own repo.

sdk/lib/_internal/pub/test/global/binstubs/utils.dart

Index: sdk/lib/_internal/pub/test/global/binstubs/utils.dart
diff --git a/sdk/lib/_internal/pub/test/global/binstubs/utils.dart b/sdk/lib/_internal/pub/test/global/binstubs/utils.dart
deleted file mode 100644
index ca70df8146bbc111fe445455f20025d69b395e60..0000000000000000000000000000000000000000
--- a/sdk/lib/_internal/pub/test/global/binstubs/utils.dart
+++ /dev/null
@@ -1,23 +0,0 @@
-// Copyright (c) 2014, 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:async';
-import 'dart:io';
-
-import 'package:path/path.dart' as p;
-
-import '../../test_pub.dart';
-
-/// The buildbots do not have the Dart SDK (containing "dart" and "pub") on
-/// their PATH, so we need to spawn the binstub process with a PATH that
-/// explicitly includes it.
-Future<Map> getEnvironment() async {
-  var binDir = p.dirname(Platform.executable);
-  var separator = Platform.operatingSystem == "windows" ? ";" : ":";
-  var path = "${Platform.environment["PATH"]}$separator$binDir";
-
-  var environment = await getPubTestEnvironment();
-  environment["PATH"] = path;
-  return environment;
-}