Unstage non-standard Promise functions

test/mjsunit/messages.js

Index: test/mjsunit/messages.js
diff --git a/test/mjsunit/messages.js b/test/mjsunit/messages.js
index 1f00f4ad9bdf747786ff7ab72cb518d8eaa6186c..5739c965cd0b456864daa109e8916efb449c85e3 100644
--- a/test/mjsunit/messages.js
+++ b/test/mjsunit/messages.js
@@ -170,11 +170,6 @@ test(function() {
   new Map([1]);
 }, "Iterator value 1 is not an entry object", TypeError);
 
-// kNotAPromise
-test(function() {
-  Promise.prototype.chain.call(1);
-}, "1 is not a promise", TypeError);
-
 // kNotConstructor
 test(function() {
   new Symbol();