SendPort + ReceivePort changes:

samples/proxy/promise.dart

Index: samples/proxy/promise.dart
diff --git a/samples/proxy/promise.dart b/samples/proxy/promise.dart
index 492339d21c6832d6b5318fb14faecfc866ead123..f3845d64f4cafec9bd724e16915800b9f9ed2246 100644
--- a/samples/proxy/promise.dart
+++ b/samples/proxy/promise.dart
@@ -171,8 +171,9 @@ class Dispatcher<T> {
 
 class PromiseProxy<T> extends PromiseImpl<T> {
   PromiseProxy(Promise<SendPort> sendCompleter) {
-    ReceivePort completer = new ReceivePort.singleShot();
-    completer.receive((var msg, SendPort _) {
+    ReceivePort completer = new ReceivePort();
+    completer.then((var msg) {
+      completer.close();
       complete(msg[0]);
     });
     sendCompleter.addCompleteHandler((SendPort port) {
@@ -527,10 +528,11 @@ class ProxyBase extends PromiseImpl<bool> {
           // This port will receive a SendPort that can be used to
           // signal completion of this promise to the corresponding
           // promise that the other end has created.
-          ReceivePort receiveCompleter = new ReceivePort.singleShot();
+          ReceivePort receiveCompleter = new ReceivePort();
           marshalled[i] = receiveCompleter.toSendPort();
           Promise<SendPort> completer = new Promise<SendPort>();
           receiveCompleter.receive((var msg, SendPort replyPort) {
+            port.close();
             completer.complete(msg[0]);
           });
           entry.addCompleteHandler((value) {