Use ASTVisitor as in new AST.

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

Index: compiler/java/com/google/dart/compiler/ast/DartDoWhileStatement.java
diff --git a/compiler/java/com/google/dart/compiler/ast/DartDoWhileStatement.java b/compiler/java/com/google/dart/compiler/ast/DartDoWhileStatement.java
index 6c5d7eab916fb68a6afb7faef44e5b5969e2cdef..957a53d517d743a7f14be666c40be4ada14e5811 100644
--- a/compiler/java/com/google/dart/compiler/ast/DartDoWhileStatement.java
+++ b/compiler/java/com/google/dart/compiler/ast/DartDoWhileStatement.java
@@ -26,22 +26,13 @@ public class DartDoWhileStatement extends DartStatement {
   }
 
   @Override
-  public void traverse(DartVisitor v, DartContext ctx) {
-    if (v.visit(this, ctx)) {
-      condition = becomeParentOf(v.accept(condition));
-      body = becomeParentOf(v.accept(body));
-    }
-    v.endVisit(this, ctx);
-  }
-
-  @Override
-  public void visitChildren(DartPlainVisitor<?> visitor) {
+  public void visitChildren(ASTVisitor<?> visitor) {
     condition.accept(visitor);
     body.accept(visitor);
   }
 
   @Override
-  public <R> R accept(DartPlainVisitor<R> visitor) {
+  public <R> R accept(ASTVisitor<R> visitor) {
     return visitor.visitDoWhileStatement(this);
   }
 }