Update elements, nodes and visitors for serialization.

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

Index: pkg/compiler/lib/src/tree/unparser.dart
diff --git a/pkg/compiler/lib/src/tree/unparser.dart b/pkg/compiler/lib/src/tree/unparser.dart
index b9e67841c37fed686ad741b209c8aa98dcdd69bd..36643594be1842b6a5e503e4639aa4c65b450402 100644
--- a/pkg/compiler/lib/src/tree/unparser.dart
+++ b/pkg/compiler/lib/src/tree/unparser.dart
@@ -636,9 +636,7 @@ class Unparser extends Indentation implements Visitor {
     visitGotoStatement(node);
   }
 
-  visitAsyncForIn(AsyncForIn node) {
-    write(node.awaitToken.value);
-    write(' ');
+  visitForIn(ForIn node) {
     write(node.forToken.value);
     space();
     write('(');
@@ -651,18 +649,14 @@ class Unparser extends Indentation implements Visitor {
     visit(node.body);
   }
 
+  visitAsyncForIn(AsyncForIn node) {
+    write(node.awaitToken.value);
+    write(' ');
+    visitForIn(node);
+  }
 
   visitSyncForIn(SyncForIn node) {
-    write(node.forToken.value);
-    space();
-    write('(');
-    visit(node.declaredIdentifier);
-    write(' ');
-    addToken(node.inToken);
-    visit(node.expression);
-    write(')');
-    space();
-    visit(node.body);
+    visitForIn(node);
   }
 
   visitLabel(Label node) {