Remove streamSpawnUri and mangler.

tests/isolate/global_error_handler_stream_test.dart

 // Copyright (c) 2013, 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 'dart:async';
 import 'dart:isolate';
 
 var firstFunction;
 var finishFunction;
 
 void runFunctions() {
   try {
     firstFunction();
   } catch (e) {
     new Timer(Duration.ZERO, finishFunction);
     throw;
   }
 }
 
-void startTest(SendPort finishPort, replyPort) {
+void startTest(StreamSink finishSink) {
   firstFunction = () { throw new RuntimeError("ignore exception"); };
-  finishFunction = () { finishPort.send("done"); };
+  finishFunction = () { finishSink.add("done"); finishPort.close(); };
   new Timer(Duration.ZERO, runFunctions);
 }
 
 runTest() {
-  port.receive(startTest);
+  stream.single.then(startTest);
 }
 
 bool globalErrorHandler(IsolateUnhandledException e) {
   return e.source is RuntimeError && e.source.message == "ignore exception";
 }
 
 main() {
-  var port = new ReceivePort();
+  var box = new MessageBox();
   var timer;
-  SendPort otherIsolate = spawnFunction(runTest, globalErrorHandler);
-  otherIsolate.send(port.toSendPort());
-  port.receive((msg, replyPort) { port.close(); timer.cancel(); });
+  StreamSink otherIsolate = streamSpawnFunction(runTest, globalErrorHandler);
+  otherIsolate.add(box.sink);
+  otherIsolate.close();
+  box.stream.single.then((msg) {
+    box.stream.close();
+    timer.cancel();
+  });
   timer = new Timer(const Duration(seconds: 2), () { throw "failed"; });
 }