Use ASTVisitor as in new AST.

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

Index: compiler/java/com/google/dart/compiler/ast/DartNewExpression.java
diff --git a/compiler/java/com/google/dart/compiler/ast/DartNewExpression.java b/compiler/java/com/google/dart/compiler/ast/DartNewExpression.java
index 23382432a328cb6b698170ef80facf1527c03bad..c4cd6a19df01c6f6e852b7dbbaf756cecda1bc3c 100644
--- a/compiler/java/com/google/dart/compiler/ast/DartNewExpression.java
+++ b/compiler/java/com/google/dart/compiler/ast/DartNewExpression.java
@@ -54,22 +54,13 @@ public class DartNewExpression extends DartInvocation implements HasSymbol {
   }
 
   @Override
-  public void traverse(DartVisitor v, DartContext ctx) {
-    if (v.visit(this, ctx)) {
-      constructor = becomeParentOf(v.accept(constructor));
-      v.acceptWithInsertRemove(this, getArgs());
-    }
-    v.endVisit(this, ctx);
-  }
-
-  @Override
-  public void visitChildren(DartPlainVisitor<?> visitor) {
+  public void visitChildren(ASTVisitor<?> visitor) {
     constructor.accept(visitor);
     visitor.visit(getArgs());
   }
 
   @Override
-  public <R> R accept(DartPlainVisitor<R> visitor) {
+  public <R> R accept(ASTVisitor<R> visitor) {
     return visitor.visitNewExpression(this);
   }
 }