Change test to not use DartOptions.

tests/standalone/src/ManyEchoServerTest.dart

Index: tests/standalone/src/ManyEchoServerTest.dart
===================================================================
--- tests/standalone/src/ManyEchoServerTest.dart	(revision 1186)
+++ tests/standalone/src/ManyEchoServerTest.dart	(working copy)
@@ -2,12 +2,14 @@
 // 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.
 // Stress test isolate generation.
-// DartOptions=-- tests/standalone/src/EchoServerTest.dart tests/standalone/src/ManyEchoServerTest.dart -- ManyEchoServerTest.testMain
 
+#library("ManyEchoServerTest.dart");
+#import("EchoServerTest.dart", prefix: "single");
+
 class ManyEchoServerTest {
   static testMain() {
     for (int i = 0; i < 5000; i++) {
-      EchoServerTest.testMain();
+      single.EchoServerTest.testMain();
     }
   }
 }