Fix ArgumentError constructor call.

sdk/lib/io/websocket_impl.dart

Index: sdk/lib/io/websocket_impl.dart
diff --git a/sdk/lib/io/websocket_impl.dart b/sdk/lib/io/websocket_impl.dart
index 17520a1ecfb72bfef75a7ebce21403d8040b1871..047cf697ea135feda1b815d4f03e09b2bbe4a04b 100644
--- a/sdk/lib/io/websocket_impl.dart
+++ b/sdk/lib/io/websocket_impl.dart
@@ -1184,7 +1184,7 @@ class _WebSocketImpl extends Stream with _ServiceObject implements WebSocket {
   void add(data) { _sink.add(data); }
   void addUtf8Text(List<int> bytes) {
     if (bytes is! List<int>) {
-      throw new ArgumentError(bytes, "bytes", "Is not a list of bytes");
+      throw new ArgumentError.value(bytes, "bytes", "Is not a list of bytes");
     }
     _sink.add(new _EncodedString(bytes));
   }