Use ASTVisitor as in new AST.

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

Index: compiler/java/com/google/dart/compiler/ast/DartTypeParameter.java
diff --git a/compiler/java/com/google/dart/compiler/ast/DartTypeParameter.java b/compiler/java/com/google/dart/compiler/ast/DartTypeParameter.java
index 2d73089ab0595d3188bd52eccf30cfcd21f91a72..11602f4263d9dfe6215547140535a1518da25de5 100644
--- a/compiler/java/com/google/dart/compiler/ast/DartTypeParameter.java
+++ b/compiler/java/com/google/dart/compiler/ast/DartTypeParameter.java
@@ -27,24 +27,14 @@ public class DartTypeParameter extends DartDeclaration<DartIdentifier> {
   }
 
   @Override
-  public void traverse(DartVisitor v, DartContext ctx) {
-    if (v.visit(this, ctx)) {
-      if (bound != null) {
-        bound = becomeParentOf(v.accept(bound));
-      }
-    }
-    v.endVisit(this, ctx);
-  }
-
-  @Override
-  public void visitChildren(DartPlainVisitor<?> visitor) {
+  public void visitChildren(ASTVisitor<?> visitor) {
     if (bound != null) {
       bound.accept(visitor);
     }
   }
 
   @Override
-  public <R> R accept(DartPlainVisitor<R> visitor) {
+  public <R> R accept(ASTVisitor<R> visitor) {
     return visitor.visitTypeParameter(this);
   }