Added 'dynamic' keyword, so that 'Dynamic' can be deprecated.

tests/compiler/dart2js/unparser2_test.dart

Index: tests/compiler/dart2js/unparser2_test.dart
diff --git a/tests/compiler/dart2js/unparser2_test.dart b/tests/compiler/dart2js/unparser2_test.dart
index 782198d368cee03d5f1552db6b74e9ac2b48679f..e99587fc31fe4663a9d11bfe84d318b26b847fe7 100644
--- a/tests/compiler/dart2js/unparser2_test.dart
+++ b/tests/compiler/dart2js/unparser2_test.dart
@@ -75,7 +75,7 @@ class MessageCollector implements DiagnosticListener {
     throw message;
   }
   void internalError(String message,
-                     [Node node, Token token, Dynamic instruction,
+                     [Node node, Token token, dynamic instruction,
                       Element element]) {
     throw message;
   }