Change memberName and namedArguments in Invocation to use Symbol.

dart/pkg/unittest/lib/mock.dart

Index: dart/pkg/unittest/lib/mock.dart
diff --git a/dart/pkg/unittest/lib/mock.dart b/dart/pkg/unittest/lib/mock.dart
index 8bdb115ce348308cb4fa449f3767149b8827056b..9ee6d8a80ce0479a40c6fc4258538304a9822e53 100644
--- a/dart/pkg/unittest/lib/mock.dart
+++ b/dart/pkg/unittest/lib/mock.dart
@@ -90,6 +90,9 @@
  */
 
 library mock;
+
+import 'dart:mirrors' show MirrorSystem;
+
 import 'matcher.dart';
 
 /**
@@ -1293,7 +1296,7 @@ class Mock {
    * thrown.
    */
   noSuchMethod(Invocation invocation) {
-    var method = invocation.memberName;
+    var method = MirrorSystem.getName(invocation.memberName);
     var args = invocation.positionalArguments;
     if (invocation.isGetter) {
       method = 'get $method';