Rationalize arg handling for pub build and serve.

sdk/lib/_internal/pub/test/build/missing_web_directory_test.dart

Index: sdk/lib/_internal/pub/test/build/missing_web_directory_test.dart
diff --git a/sdk/lib/_internal/pub/test/build/missing_web_directory_test.dart b/sdk/lib/_internal/pub/test/build/missing_web_directory_test.dart
deleted file mode 100644
index 953ee7427d8212208d2a3518d1b5656f8d7d8e52..0000000000000000000000000000000000000000
--- a/sdk/lib/_internal/pub/test/build/missing_web_directory_test.dart
+++ /dev/null
@@ -1,30 +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 '../../lib/src/exit_codes.dart' as exit_codes;
-import '../descriptor.dart' as d;
-import '../test_pub.dart';
-
-main() {
-  initConfig();
-
-  integration("fails if 'web' doesn't exist and no directory is specified", () {
-    d.appDir().create();
-
-    schedulePub(args: ["build"],
-        error: 'Directory "web" does not exist.',
-        exitCode: exit_codes.DATA);
-  });
-
-  integration("fails if 'web' doesn't exist and no directory is specified "
-      "with JSON output", () {
-    d.appDir().create();
-
-    schedulePub(args: ["build", "--format", "json"],
-        outputJson: {
-          "error": 'Directory "web" does not exist.'
-        },
-        exitCode: exit_codes.DATA);
-  });
-}