Move all tests using dart:io to a separate directory

tests/standalone/src/ProcessBrokenPipeTest.dart

Index: tests/standalone/src/ProcessBrokenPipeTest.dart
diff --git a/tests/standalone/src/ProcessBrokenPipeTest.dart b/tests/standalone/src/ProcessBrokenPipeTest.dart
deleted file mode 100644
index 142496580a4241bc2e3b83723d6bd49f10d2b8e8..0000000000000000000000000000000000000000
--- a/tests/standalone/src/ProcessBrokenPipeTest.dart
+++ /dev/null
@@ -1,21 +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.
-//
-// Process test program to test closed stdin from child process.
-
-#import('dart:io');
-
-#source("ProcessTestUtil.dart");
-
-main() {
-  // Running dart without arguments makes it close right away.
-  Process process = new Process.start(getDartFileName(), []);
-
-  // Write to the stdin after the process is terminated to test
-  // writing to a broken pipe.
-  process.onExit = (code) {
-    Expect.isFalse(process.stdin.write([0]));
-    process.close();
-  };
-}