Rationalize arg handling for pub build and serve.

sdk/lib/_internal/pub/test/serve/roots/serves_urls_from_custom_roots_test.dart

Index: sdk/lib/_internal/pub/test/serve/roots/serves_urls_from_custom_roots_test.dart
diff --git a/sdk/lib/_internal/pub/test/serve/roots/serves_urls_from_custom_roots_test.dart b/sdk/lib/_internal/pub/test/serve/roots/serves_urls_from_custom_roots_test.dart
deleted file mode 100644
index 885d3e69383444c968db85d09d5448f5a32ba243..0000000000000000000000000000000000000000
--- a/sdk/lib/_internal/pub/test/serve/roots/serves_urls_from_custom_roots_test.dart
+++ /dev/null
@@ -1,31 +0,0 @@
-// Copyright (c) 2014, 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 file.
-
-library pub_tests;
-
-import 'package:path/path.dart' as p;
-
-import '../../descriptor.dart' as d;
-import '../../test_pub.dart';
-import '../utils.dart';
-
-main() {
-  initConfig();
-  integration("serves URLs from custom roots", () {
-    d.dir(appPath, [
-      d.appPubspec(),
-      d.dir("example", [
-        d.dir("foo", [d.file("bar", "contents")])
-      ]),
-      d.dir("dir", [d.file("baz", "contents")]),
-      d.dir("web", [d.file("bang", "contents")])
-    ]).create();
-
-    pubServe(args: [p.join("example", "foo"), "dir"]);
-    requestShouldSucceed("bar", "contents", root: p.join("example", "foo"));
-    requestShouldSucceed("baz", "contents", root: "dir");
-    requestShould404("bang", root: "dir");
-    endPubServe();
-  });
-}