Start pulling pub from its own repo.

sdk/lib/_internal/pub/test/run/errors_if_path_in_dependency_test.dart

-// 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 '../../lib/src/exit_codes.dart' as exit_codes;
-import '../descriptor.dart' as d;
-import '../test_pub.dart';
-
-main() {
-  initConfig();
-  integration('Errors if the executable is in a subdirectory in a '
-      'dependency.', () {
-    d.dir("foo", [
-      d.libPubspec("foo", "1.0.0")
-    ]).create();
-
-    d.dir(appPath, [
-      d.appPubspec({
-        "foo": {"path": "../foo"}
-      })
-    ]).create();
-
-    schedulePub(args: ["run", "foo:sub/dir"],
-        error: """
-Cannot run an executable in a subdirectory of a dependency.
-
-Usage: pub run <executable> [args...]
--h, --help    Print this usage information.
-    --mode    Mode to run transformers in.
-              (defaults to "release" for dependencies, "debug" for entrypoint)
-
-Run "pub help" to see global options.
-""",
-        exitCode: exit_codes.USAGE);
-  });
-}