Use ASTVisitor as in new AST.

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

Index: compiler/java/com/google/dart/compiler/ast/DartVariableStatement.java
diff --git a/compiler/java/com/google/dart/compiler/ast/DartVariableStatement.java b/compiler/java/com/google/dart/compiler/ast/DartVariableStatement.java
index 7d28b8eec6f545c31ceb9d57d7dc6fbe90a6fc52..e3d18e2978054665f8c774527c9d3ee8b025cf4b 100644
--- a/compiler/java/com/google/dart/compiler/ast/DartVariableStatement.java
+++ b/compiler/java/com/google/dart/compiler/ast/DartVariableStatement.java
@@ -38,18 +38,7 @@ public class DartVariableStatement extends DartStatement {
   }
 
   @Override
-  public void traverse(DartVisitor v, DartContext ctx) {
-    if (v.visit(this, ctx)) {
-      if (typeNode != null) {
-        typeNode = becomeParentOf(v.accept(typeNode));
-      }
-      v.acceptWithInsertRemove(this, getVariables());
-    }
-    v.endVisit(this, ctx);
-  }
-
-  @Override
-  public void visitChildren(DartPlainVisitor<?> visitor) {
+  public void visitChildren(ASTVisitor<?> visitor) {
     if (typeNode != null) {
       typeNode.accept(visitor);
     }
@@ -57,7 +46,7 @@ public class DartVariableStatement extends DartStatement {
   }
 
   @Override
-  public <R> R accept(DartPlainVisitor<R> visitor) {
+  public <R> R accept(ASTVisitor<R> visitor) {
     return visitor.visitVariableStatement(this);
   }
 }