Merge three PromiseEvent's into one.

test/mjsunit/es6/debug-promises-new-event.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
-
-Debug = debug.Debug;
-
-var exception = null;
-var new_promise;
-
-function listener(event, exec_state, event_data, data) {
-  if (!(event_data instanceof debug.NewPromiseEvent)) return;
-  try {
-    assertTrue(event_data.resolver().isFunction());
-    assertEquals(resolver, event_data.resolver().value());
-    assertTrue(event_data.resolver().resolved());
-    assertEquals("resolver", event_data.resolver().name());
-    assertTrue(event_data.resolver().source().indexOf("Token") > 0);
-
-    assertTrue(event_data.promise().isPromise());
-    new_promise = event_data.promise().value();
-    assertEquals("pending", event_data.promise().status());
-  } catch (e) {
-    print(e + e.stack)
-    exception = e;
-  }
-}
-
-Debug.setListener(listener);
-
-function resolver(resolve, reject) {
-  resolve();  // Token
-}
-
-var p = new Promise(resolver);
-assertEquals(new_promise, p);
-
-assertNull(exception);
-Debug.setListener(null);