Revert "Added support for skipping redundant dart2js compilations."

tests/standalone/io/skipping_dart2js_compilations_helper.dart

Index: tests/standalone/io/skipping_dart2js_compilations_helper.dart
diff --git a/tests/standalone/io/skipping_dart2js_compilations_helper.dart b/tests/standalone/io/skipping_dart2js_compilations_helper.dart
deleted file mode 100644
index 3ab0d707a986c694b695106b7bc9e001eac91540..0000000000000000000000000000000000000000
--- a/tests/standalone/io/skipping_dart2js_compilations_helper.dart
+++ /dev/null
@@ -1,11 +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.
-
-#import ('dart:io');
-
-main() {
-  var outputFile = new Options().arguments[0];
-  var file = new File(outputFile);
-  file.createSync();
-}