Update elements, nodes and visitors for serialization.

pkg/compiler/lib/src/tree/prettyprint.dart

Index: pkg/compiler/lib/src/tree/prettyprint.dart
diff --git a/pkg/compiler/lib/src/tree/prettyprint.dart b/pkg/compiler/lib/src/tree/prettyprint.dart
index 1b17b7ab75dded52c39e54fa190996f2e88855d5..3ad26bd4f1c6b0c151dd5e20ddad89ca4e666e9b 100644
--- a/pkg/compiler/lib/src/tree/prettyprint.dart
+++ b/pkg/compiler/lib/src/tree/prettyprint.dart
@@ -124,14 +124,19 @@ class PrettyPrinter extends Indentation with Tagging<Node> implements Visitor {
     visitNodeWithChildren(node, "For");
   }
 
+  visitForIn(ForIn node) {
+    node.visitChildren(this);
+    closeNode();
+  }
+
   visitAsyncForIn(AsyncForIn node) {
     openNode(node, "AsyncForIn");
+    visitForIn(node);
   }
 
   visitSyncForIn(SyncForIn node) {
-    openNode(node, "ForIn");
-    node.visitChildren(this);
-    closeNode();
+    openNode(node, "SyncForIn");
+    visitForIn(node);
   }
 
   visitFunctionDeclaration(FunctionDeclaration node) {