Dart: Removes C++ set for closing handles on an unhandled exception.

mojo/dart/test/unhandled_exception_test.dart

Index: mojo/dart/test/unhandled_exception_test.dart
diff --git a/base/test/malloc_wrapper.cc b/mojo/dart/test/unhandled_exception_test.dart
similarity index 59%
copy from base/test/malloc_wrapper.cc
copy to mojo/dart/test/unhandled_exception_test.dart
index eb280a3eeea52f49e534c7c5e3f6f7a40e80a750..7579c93e9494a6a0becf4f791ab079629bfd6506 100644
--- a/base/test/malloc_wrapper.cc
+++ b/mojo/dart/test/unhandled_exception_test.dart
@@ -2,10 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "malloc_wrapper.h"
+import 'package:mojo/core.dart';
 
-#include <stdlib.h>
-
-void* MallocWrapper(size_t size) {
-  return malloc(size);
+void main() {
+  var pipe = new MojoMessagePipe();
+  throw "Unhandled Exception";
 }