Change the field and constructor parameter types of NoSuchMethodError to Symbol.

sdk/lib/js/dartium/js_dartium.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.
 
 /**
  * The js.dart library provides simple JavaScript invocation from Dart that
  * works on both Dartium and on other modern browsers via Dart2JS.
  *
  * It provides a model based on scoped [JsObject] objects.  Proxies give Dart
  * code access to JavaScript objects, fields, and functions as well as the
@@ skipping 193 matching lines @@
     return _forward(this, name, 'method', args != null ? args : []);
   }
 
   // Forward member accesses to the backing JavaScript object.
   static _forward(JsObject receiver, String member, String kind, List args) {
     var result = receiver._port.callSync([receiver._id, member, kind,
                                           args.map(_serialize).toList()]);
     switch (result[0]) {
       case 'return': return _deserialize(result[1]);
       case 'throws': throw _deserialize(result[1]);
-      case 'none': throw new NoSuchMethodError(receiver, member, args, {});
+      case 'none':
+          throw new NoSuchMethodError(receiver, new Symbol(member), args, {});
       default: throw 'Invalid return value';
     }
   }
 }
 
 /// A [JsObject] subtype to JavaScript functions.
 class JsFunction extends JsObject implements Serializable<JsFunction> {
   JsFunction._internal(SendPortSync port, String id)
       : super._internal(port, id);
 
@@ skipping 143 matching lines @@
     // Serialized type.
     return message;
   }
   var tag = message[0];
   switch (tag) {
     case 'funcref': return deserializeFunction(message);
     case 'objref': return deserializeObject(message);
   }
   throw 'Unsupported serialized data: $message';
 }