Fix PromiseHasRejectHandler.

test/mjsunit/es6/debug-promises/throw-eventually-caught.js

 // Copyright 2014 the V8 project authors. All rights reserved.
 // 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
 
 // Test debug events when we only listen to uncaught exceptions and
 // there is a catch handler for the to-be-rejected Promise.
-// We expect no debug event to be triggered.
+// We expect no Exception debug events, since the default reject handler passes
+// the rejection on to a user-defined reject handler.
 
 Debug = debug.Debug;
 
-var p = new Promise(function(resolve, reject) {
-  resolve();
+var resolve, reject;
+var p0 = new Promise(function(res, rej) { resolve = res; reject = rej; });
+
+var p1 = p0.then(function() {
+  throw new Error();
 });
 
-var q = p.chain(
-  function() {
-    return Promise.reject(Error("caught reject"));
-  });
+var p2 = p1.then(function() { });
+var p3 = p2.catch(function() { });
 
-q.catch(
-  function(e) {
-    assertEquals("caught reject", e.message);
-  });
+var q = new Promise(function(res, rej) {
+  res();
+});
+
+q.then(function() {
+  resolve();
+})
+
 
 function listener(event, exec_state, event_data, data) {
   try {
     assertTrue(event != Debug.DebugEvent.Exception);
   } catch (e) {
     %AbortJS(e + "\n" + e.stack);
   }
 }
 
 Debug.setBreakOnUncaughtException();
 Debug.setListener(listener);