Remove streamSpawnUri and mangler.

tests/isolate/illegal_msg_stream_test.dart

Index: tests/isolate/illegal_msg_stream_test.dart
diff --git a/tests/isolate/illegal_msg_test.dart b/tests/isolate/illegal_msg_stream_test.dart
similarity index 51%
copy from tests/isolate/illegal_msg_test.dart
copy to tests/isolate/illegal_msg_stream_test.dart
index 51b442ccdc8a6bd612039a2bf568daed62c1bca4..b9e0a0d21603317d062beed3ff5a30bb2ba91213 100644
--- a/tests/isolate/illegal_msg_test.dart
+++ b/tests/isolate/illegal_msg_stream_test.dart
@@ -2,32 +2,31 @@
 // 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.
 
-library illegal_msg_tests;
 import 'dart:isolate';
 
 funcFoo(x) => x + 2;
 
-echo() {
-  port.receive((msg, reply) {
-    reply.send("echoing ${msg(1)}}");
+foo() {
+  stream.single.then((msg) {
+    IsolateSink sink = msg;
+    sink.add(499);
+    sink.close();
   });
 }
 
 main() {
-  var snd = spawnFunction(echo);
+  var box = new MessageBox();
+  var snd = streamSpawnFunction(foo);
   var caught_exception = false;
   try {
-    snd.send(funcFoo, port.toSendPort());
+    snd.add(funcFoo);
   } catch (e) {
     caught_exception = true;
   }
+  snd.add(box.sink);
+  snd.close();
 
-  if (caught_exception) {
-    port.close();
-  } else {
-    port.receive((msg, reply) {
-      print("from worker ${msg}");
-    });
-  }
-  Expect.isTrue(caught_exception);
+  box.stream.single.then((msg) {
+    Expect.equals(499, msg);
+  });
 }