Use ASTVisitor as in new AST.

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

Index: compiler/java/com/google/dart/compiler/ast/DartIntegerLiteral.java
diff --git a/compiler/java/com/google/dart/compiler/ast/DartIntegerLiteral.java b/compiler/java/com/google/dart/compiler/ast/DartIntegerLiteral.java
index e00ff421107b739e7e5222b80d6fc6a57517e3be..ac25f822e347a8d035de98ce4d72ceb0fbf31e2a 100644
--- a/compiler/java/com/google/dart/compiler/ast/DartIntegerLiteral.java
+++ b/compiler/java/com/google/dart/compiler/ast/DartIntegerLiteral.java
@@ -30,17 +30,11 @@ public class DartIntegerLiteral extends DartLiteral {
   }
 
   @Override
-  public void traverse(DartVisitor v, DartContext ctx) {
-    v.visit(this, ctx);
-    v.endVisit(this, ctx);
+  public void visitChildren(ASTVisitor<?> visitor) {
   }
 
   @Override
-  public void visitChildren(DartPlainVisitor<?> visitor) {
-  }
-
-  @Override
-  public <R> R accept(DartPlainVisitor<R> visitor) {
+  public <R> R accept(ASTVisitor<R> visitor) {
     return visitor.visitIntegerLiteral(this);
   }
 }