Remove --promise-extra flag

test/mjsunit/es6/debug-promises/reject-with-throw-in-reject.js

Index: test/mjsunit/es6/debug-promises/reject-with-throw-in-reject.js
diff --git a/test/mjsunit/es6/debug-promises/reject-with-throw-in-reject.js b/test/mjsunit/es6/debug-promises/reject-with-throw-in-reject.js
index b6c06df49e7ed91f1af6b84c85c8150a0b0ee1c6..47e335d96821a70b4dc782193e70d02c1fa942e6 100644
--- a/test/mjsunit/es6/debug-promises/reject-with-throw-in-reject.js
+++ b/test/mjsunit/es6/debug-promises/reject-with-throw-in-reject.js
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --expose-debug-as debug --allow-natives-syntax --promise-extra
+// Flags: --expose-debug-as debug --allow-natives-syntax
 
 // Test debug events when a Promise is rejected, which is caught by a
 // custom promise, which throws a new exception in its reject handler.
@@ -33,7 +33,7 @@ function MyPromise(resolver) {
 MyPromise.prototype = new Promise(function() {});
 p.constructor = MyPromise;
 
-var q = p.chain(
+var q = p.then(
   function() {
     log.push("reject caught");
     return Promise.reject(new Error("caught"));