Use ASTVisitor as in new AST.

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

Index: compiler/java/com/google/dart/compiler/ast/DartArrayAccess.java
diff --git a/compiler/java/com/google/dart/compiler/ast/DartArrayAccess.java b/compiler/java/com/google/dart/compiler/ast/DartArrayAccess.java
index 75136f0341072ec7d84430b6628eb34206ef3504..debc10c5e9aa3652ec4e5fe91870335a74364f93 100644
--- a/compiler/java/com/google/dart/compiler/ast/DartArrayAccess.java
+++ b/compiler/java/com/google/dart/compiler/ast/DartArrayAccess.java
@@ -34,22 +34,13 @@ public class DartArrayAccess extends DartExpression implements ElementReference
   }
 
   @Override
-  public void traverse(DartVisitor v, DartContext ctx) {
-    if (v.visit(this, ctx)) {
-      target = becomeParentOf(v.accept(target));
-      key = becomeParentOf(v.accept(key));
-    }
-    v.endVisit(this, ctx);
-  }
-
-  @Override
-  public void visitChildren(DartPlainVisitor<?> visitor) {
+  public void visitChildren(ASTVisitor<?> visitor) {
     target.accept(visitor);
     key.accept(visitor);
   }
 
   @Override
-  public <R> R accept(DartPlainVisitor<R> visitor) {
+  public <R> R accept(ASTVisitor<R> visitor) {
     return visitor.visitArrayAccess(this);
   }