Use ASTVisitor as in new AST.

compiler/javatests/com/google/dart/compiler/resolver/ResolverAuditVisitor.java

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 package com.google.dart.compiler.resolver;
 
 import com.google.common.base.Joiner;
 import com.google.common.collect.Lists;
 import com.google.dart.compiler.ast.DartClass;
 import com.google.dart.compiler.ast.DartIdentifier;
 import com.google.dart.compiler.ast.DartNode;
-import com.google.dart.compiler.ast.DartNodeTraverser;
+import com.google.dart.compiler.ast.ASTVisitor;
 import com.google.dart.compiler.ast.DartParameterizedTypeNode;
 import com.google.dart.compiler.ast.DartTypeNode;
 import com.google.dart.compiler.ast.DartTypeParameter;
 
 import java.util.List;
 
 /**
  * Look for  DartIdentifier nodes in the tree whose symbols are null.  They should all either
  * be resolved, or marked as an unresolved element.
  */
-public class ResolverAuditVisitor extends DartNodeTraverser<Void> {
+public class ResolverAuditVisitor extends ASTVisitor<Void> {
   public static void exec(DartNode root) {
     ResolverAuditVisitor visitor = new ResolverAuditVisitor();
     root.accept(visitor);
     List<String> results = visitor.getFailures();
     if (results.size() > 0) {
       StringBuilder out = new StringBuilder("Missing symbols found in AST\n");
       Joiner.on("\n").appendTo(out, results);
       ResolverTestCase.fail(out.toString());
     }
   }
@@ skipping 36 matching lines @@
 
   @Override
   public Void visitTypeParameter(DartTypeParameter node) {
     node.getName().accept(this);
     if (node.getBound() != null) {
       node.getBound().accept(this);
     }
     return null;
   }
 }