Use ASTVisitor as in new AST.

compiler/java/com/google/dart/compiler/ast/DartSuperExpression.java

Index: compiler/java/com/google/dart/compiler/ast/DartSuperExpression.java
diff --git a/compiler/java/com/google/dart/compiler/ast/DartSuperExpression.java b/compiler/java/com/google/dart/compiler/ast/DartSuperExpression.java
index 97a6309f991f193d5cd7ba0057af852cf891d300..54567d5db439e854221b087cf21666d01be49551 100644
--- a/compiler/java/com/google/dart/compiler/ast/DartSuperExpression.java
+++ b/compiler/java/com/google/dart/compiler/ast/DartSuperExpression.java
@@ -32,17 +32,11 @@ public class DartSuperExpression extends DartExpression {
   }
 
   @Override
-  public void traverse(DartVisitor v, DartContext ctx) {
-    v.visit(this, ctx);
-    v.endVisit(this, ctx);
+  public void visitChildren(ASTVisitor<?> visitor) {
   }
 
   @Override
-  public void visitChildren(DartPlainVisitor<?> visitor) {
-  }
-
-  @Override
-  public <R> R accept(DartPlainVisitor<R> visitor) {
+  public <R> R accept(ASTVisitor<R> visitor) {
     return visitor.visitSuperExpression(this);
   }
 }