Fix debug-promises tests.

test/mjsunit/es6/debug-promises/reject-with-undefined-reject.js

Index: test/mjsunit/es6/debug-promises/reject-with-undefined-reject.js
diff --git a/test/mjsunit/es6/debug-promises/reject-with-undefined-reject.js b/test/mjsunit/es6/debug-promises/reject-with-undefined-reject.js
index 39dabcf113d13e094bd417848b544fa22ac8758e..d11c01ff73b6216cab278aa850e7fa45c49cf2d8 100644
--- a/test/mjsunit/es6/debug-promises/reject-with-undefined-reject.js
+++ b/test/mjsunit/es6/debug-promises/reject-with-undefined-reject.js
@@ -42,7 +42,6 @@ function listener(event, exec_state, event_data, data) {
       assertEquals("caught", event_data.exception().message);
       // All of the frames on the stack are from native Javascript.
       assertEquals(0, exec_state.frameCount());
-      assertEquals(q, event_data.promise());
     }
   } catch (e) {
     %AbortJS(e + "\n" + e.stack);