Use ASTVisitor as in new AST.

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

Index: compiler/java/com/google/dart/compiler/ast/DartDefault.java
diff --git a/compiler/java/com/google/dart/compiler/ast/DartDefault.java b/compiler/java/com/google/dart/compiler/ast/DartDefault.java
index c495f5213cae579384d2ce03cf725efc0209c65b..fc5577c09512b5db804e08df4dc17e3c4d5051e4 100644
--- a/compiler/java/com/google/dart/compiler/ast/DartDefault.java
+++ b/compiler/java/com/google/dart/compiler/ast/DartDefault.java
@@ -16,15 +16,7 @@ public class DartDefault extends DartSwitchMember {
   }
 
   @Override
-  public void traverse(DartVisitor v, DartContext ctx) {
-    if (v.visit(this, ctx)) {
-      v.acceptWithInsertRemove(this, getStatements());
-    }
-    v.endVisit(this, ctx);
-  }
-
-  @Override
-  public <R> R accept(DartPlainVisitor<R> visitor) {
+  public <R> R accept(ASTVisitor<R> visitor) {
     return visitor.visitDefault(this);
   }
 }