Fix names of some tests in dart2js_extra.

tests/compiler/dart2js_extra/runtime_type_isolate.dart

Index: tests/compiler/dart2js_extra/runtime_type_isolate.dart
diff --git a/tests/compiler/dart2js_extra/runtime_type_isolate.dart b/tests/compiler/dart2js_extra/runtime_type_isolate.dart
deleted file mode 100644
index b1b95047939b79ac6be1a5e3b66f14e9e6c09d88..0000000000000000000000000000000000000000
--- a/tests/compiler/dart2js_extra/runtime_type_isolate.dart
+++ /dev/null
@@ -1,16 +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 "package:expect/expect.dart";
-import 'dart:isolate';
-
-class Bar {}
-
-main() {
-  final port = new ReceivePort();
-  port.receive((msg, reply) {
-    Expect.equals(new Bar().runtimeType.toString(), 'Bar');
-  });
-  port.sendPort.send(null);
-}