Use ASTVisitor as in new AST.

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

Index: compiler/java/com/google/dart/compiler/ast/DartTypeExpression.java
diff --git a/compiler/java/com/google/dart/compiler/ast/DartTypeExpression.java b/compiler/java/com/google/dart/compiler/ast/DartTypeExpression.java
index 4c788672b03554489179bb377dd67923df633223..8ec9dd19695dd0fd92fedd43756fbe3ea605493d 100644
--- a/compiler/java/com/google/dart/compiler/ast/DartTypeExpression.java
+++ b/compiler/java/com/google/dart/compiler/ast/DartTypeExpression.java
@@ -20,20 +20,12 @@ public class DartTypeExpression extends DartExpression {
   }
 
   @Override
-  public void traverse(DartVisitor v, DartContext ctx) {
-    if (v.visit(this, ctx)) {
-      typeNode = becomeParentOf(v.accept(typeNode));
-    }
-    v.endVisit(this, ctx);
-  }
-
-  @Override
-  public void visitChildren(DartPlainVisitor<?> visitor) {
+  public void visitChildren(ASTVisitor<?> visitor) {
     typeNode.accept(visitor);
   }
 
   @Override
-  public <R> R accept(DartPlainVisitor<R> visitor) {
+  public <R> R accept(ASTVisitor<R> visitor) {
     return visitor.visitTypeExpression(this);
   }
 }