remove remaining V8_ALLOW_ACCESS_TO* defines from test classes

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index b32f58851117074332a392b6cc14a52155a62726..7d55936ae12d2f617cdbb00e3aeacfd9ae57615c 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -519,6 +519,10 @@ template <class T> class Persistent // NOLINT
   template <class S> V8_INLINE(Persistent(Isolate* isolate, Handle<S> that))
       : val_(*New(isolate, that)) { }
 
+  template <class S> V8_INLINE(Persistent(Isolate* isolate,
+                                          Persistent<S>& that)) // NOLINT
+      : val_(*New(isolate, that)) { }
+
 #else
   /**
    * Creates an empty persistent handle that doesn't point to any