Update unittest to new package layout.

pkg/unittest/vm_config.dart

Index: pkg/unittest/vm_config.dart
diff --git a/pkg/unittest/vm_config.dart b/pkg/unittest/vm_config.dart
deleted file mode 100644
index 73bfc0ed488de31c7ba5c687f8cf3915faf8141f..0000000000000000000000000000000000000000
--- a/pkg/unittest/vm_config.dart
+++ /dev/null
@@ -1,28 +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.
-
-/**
- * A simple unit test library for running tests on the VM.
- */
-#library('unittest');
-
-#import('dart:io');
-#import('unittest.dart');
-
-class VmConfiguration extends Configuration {
-  void onDone(int passed, int failed, int errors, List<TestCase> results,
-      String uncaughtError) {
-    try {
-      super.onDone(passed, failed, errors, results, uncaughtError);
-    } on Exception catch (ex) {
-      // A non-zero exit code is used by the test infrastructure to detect
-      // failure.
-      exit(1);
-    }
-  }
-}
-
-void useVmConfiguration() {
-  configure(new VmConfiguration());
-}