Handle resolution of Class.named<TypeArg> correctly.

sdk/lib/_internal/lib/isolate_helper.dart

Index: sdk/lib/_internal/lib/isolate_helper.dart
diff --git a/sdk/lib/_internal/lib/isolate_helper.dart b/sdk/lib/_internal/lib/isolate_helper.dart
index 8b0ad62a9b2a8a245f6367322bb0991617b03f41..7d9e722c046e07d9b4576ac114ec2d9bf0e47e94 100644
--- a/sdk/lib/_internal/lib/isolate_helper.dart
+++ b/sdk/lib/_internal/lib/isolate_helper.dart
@@ -600,7 +600,7 @@ class IsolateNatives {
     // TODO(floitsch): support precompiled version of dart2js output.
     if (uri != null && uri.endsWith(".dart")) uri += ".js";
 
-    Completer<SendPort> completer = new Completer.sync<SendPort>();
+    Completer<SendPort> completer = new Completer<SendPort>.sync();
     ReceivePort port = new ReceivePort();
     port.receive((msg, SendPort replyPort) {
       port.close();