Make args package follow new layout.

pkg/args/utils.dart

Index: pkg/args/utils.dart
diff --git a/pkg/args/utils.dart b/pkg/args/utils.dart
deleted file mode 100644
index 029ada304eb35097762c2c52b54fe878dca22972..0000000000000000000000000000000000000000
--- a/pkg/args/utils.dart
+++ /dev/null
@@ -1,19 +0,0 @@
-// Copyright (c) 2012, 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.
-
-// TODO(rnystrom): This file was copied from pub.
-/** Generic utility functions. Stuff that should possibly be in core. */
-#library('args_utils');
-
-/** Pads [source] to [length] by adding spaces at the end. */
-String padRight(String source, int length) {
-  final result = new StringBuffer();
-  result.add(source);
-
-  while (result.length < length) {
-    result.add(' ');
-  }
-
-  return result.toString();
-}