Provide mechanism to close immediately to Dart bindings

mojo/public/dart/src/proxy.dart

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 part of bindings;
 
 class ProxyCloseException {
   final String message;
   ProxyCloseException(this.message);
   String toString() => message;
@@ skipping 29 matching lines @@
     assert(result.status.isOk || result.status.isResourceExhausted);
     var message = new ServiceMessage.fromMessage(new Message(bytes, handles));
     handleResponse(message);
   }
 
   void handleWrite() {
     throw 'Unexpected write signal in proxy.';
   }
 
   @override
-  Future close({bool nodefer: false}) {
+  Future close({bool immediate: false}) {
     for (var completer in _completerMap.values) {
       completer.completeError(new ProxyCloseException('Proxy closed'));
     }
     _completerMap.clear();
-    return super.close(nodefer: nodefer);
+    return super.close(immediate: immediate);
   }
 
   void sendMessage(Struct message, int name) {
     if (!isOpen) {
       listen();
     }
     var header = new MessageHeader(name);
     var serviceMessage = message.serializeWithHeader(header);
     endpoint.write(serviceMessage.buffer,
         serviceMessage.buffer.lengthInBytes, serviceMessage.handles);
@@ skipping 30 matching lines @@
     var superString = super.toString();
     return "Proxy(${superString})";
   }
 }
 
 // Generated Proxy classes implement this interface.
 abstract class ProxyBase {
   final Proxy impl = null;
   final String name = null;
 }