Remove hack for finding package-root in tests, now available in Platform

pkg/intl/test/message_extraction/message_extraction_test.dart

 // Copyright (c) 2013, 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.
 
 library message_extraction_test;
 
 import 'package:unittest/unittest.dart';
 import 'dart:io';
 import 'dart:async';
 import 'package:path/path.dart' as path;
 import '../data_directory.dart';
 
 final dart = Platform.executable;
 
-// TODO(alanknight): We have no way of knowing what the package-root is,
-// so when we're running under the test framework, which sets the
-// package-root, we use a horrible hack and infer it from the executable.
-final packageDir = _findPackageDir(dart);
-
-/**
- * Find our package directory from the executable. If we seem to be running
- * from out/Release<arch>/dart or the equivalent Debug, then use the packages
- * directory under Release<arch>. Otherwise return null, indicating to use
- * the normal pub packages directory.
- */
-String _findPackageDir(executable) {
-  var oneUp = path.dirname(executable);
-  var tail = path.basename(oneUp);
-  // If we're running from test.dart, we want e.g. out/ReleaseIA32/packages
-  if (tail.contains('Release') || tail.contains('Debug')) {
-      return path.join(oneUp, 'packages/');
-  }
-  // Check for the case where we're running Release<arch>/dart-sdk/bin/dart
-  // (pub bots)
-  var threeUp = path.dirname(path.dirname(oneUp));
-  tail = path.basename(threeUp);
-  if (tail.contains('Release') || tail.contains('Debug')) {
-      return path.join(threeUp, 'packages/');
-  }
-  // Otherwise we will rely on the normal packages directory.
-  return null;
-}
-
-/** If our package root directory is set, return it as a VM argument. */
-final vmArgs = (packageDir == null) ? [] : ['--package-root=$packageDir'];
+/** The VM arguments we were given, most important package-root. */
+final vmArgs = Platform.executableArguments;
 
 /**
  * Translate a file path into this test directory, regardless of the
  * working directory.
  */
 String dir([String s]) {
   if (s != null && s.startsWith("--")) { // Don't touch command-line options.
     return s;
   } else {
    return path.join(intlDirectory, 'test', 'message_extraction', s);
@@ skipping 213 matching lines @@
   verify('Null');
   verify('ein');
   verify('Mann');
   verify('Frau');
   verify('7 Mann');
   verify('7 Kanadischen dollar');
   verify('5 einige Währung oder anderen.');
   verify('1 Kanadischer dollar');
   verify('2 Kanadischen dollar');
 }