Use ASTVisitor as in new AST.

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

Index: compiler/java/com/google/dart/compiler/ast/DartForInStatement.java
diff --git a/compiler/java/com/google/dart/compiler/ast/DartForInStatement.java b/compiler/java/com/google/dart/compiler/ast/DartForInStatement.java
index 31f096c399ea519bc8794f50647a6cf8a1e2190c..1b294a474fb9398e1a6666a9f9dfaea561265172 100644
--- a/compiler/java/com/google/dart/compiler/ast/DartForInStatement.java
+++ b/compiler/java/com/google/dart/compiler/ast/DartForInStatement.java
@@ -55,24 +55,14 @@ public class DartForInStatement extends DartStatement {
   }
 
   @Override
-  public void traverse(DartVisitor v, DartContext ctx) {
-    if (v.visit(this, ctx)) {
-      setup = becomeParentOf(v.accept(setup));
-      iterable = becomeParentOf(v.accept(iterable));
-      body = becomeParentOf(v.accept(body));
-    }
-    v.endVisit(this, ctx);
-  }
-
-  @Override
-  public void visitChildren(DartPlainVisitor<?> visitor) {
+  public void visitChildren(ASTVisitor<?> visitor) {
     setup.accept(visitor);
     iterable.accept(visitor);
     body.accept(visitor);
   }
 
   @Override
-  public <R> R accept(DartPlainVisitor<R> visitor) {
+  public <R> R accept(ASTVisitor<R> visitor) {
     return visitor.visitForInStatement(this);
   }
 }