Reland "Don't report promise rejection events during the microtask checkpoint"

third_party/WebKit/LayoutTests/fast/events/constructors/promise-rejection-event-constructor.html

Index: third_party/WebKit/LayoutTests/fast/events/constructors/promise-rejection-event-constructor.html
diff --git a/third_party/WebKit/LayoutTests/fast/events/constructors/promise-rejection-event-constructor.html b/third_party/WebKit/LayoutTests/fast/events/constructors/promise-rejection-event-constructor.html
index f1649a2d4446cbadacb09d3d69fa69c895109980..33f3439a61801ba048b507986a3fe282db3d36c1 100644
--- a/third_party/WebKit/LayoutTests/fast/events/constructors/promise-rejection-event-constructor.html
+++ b/third_party/WebKit/LayoutTests/fast/events/constructors/promise-rejection-event-constructor.html
@@ -6,35 +6,27 @@
 'use strict';
 
 test(function() {
-  var p = new Promise(function(resolve, reject) {});
-
   // No initializer is passed.
   assert_equals(new PromiseRejectionEvent('eventType').bubbles, false);
   assert_equals(new PromiseRejectionEvent('eventType').cancelable, false);
   assert_equals(new PromiseRejectionEvent('eventType').promise, null);
   assert_equals(new PromiseRejectionEvent('eventType').reason, null);
 
-  // No promise is passed.
-  assert_throws(new TypeError(),
-                function() {
-                  new PromiseRejectionEvent('eventType', { bubbles: false });
-                }, 
-                'Cannot construct PromiseRejectionEventInit without promise');
-
   // bubbles is passed.
-  assert_equals(new PromiseRejectionEvent('eventType', { bubbles: false, promise: p }).bubbles, false);
-  assert_equals(new PromiseRejectionEvent('eventType', { bubbles: true, promise: p }).bubbles, true);
+  assert_equals(new PromiseRejectionEvent('eventType', { bubbles: false }).bubbles, false);
+  assert_equals(new PromiseRejectionEvent('eventType', { bubbles: true }).bubbles, true);
 
   // cancelable is passed.
-  assert_equals(new PromiseRejectionEvent('eventType', { cancelable: false, promise: p }).cancelable, false);
-  assert_equals(new PromiseRejectionEvent('eventType', { cancelable: true, promise: p }).cancelable, true);
+  assert_equals(new PromiseRejectionEvent('eventType', { cancelable: false }).cancelable, false);
+  assert_equals(new PromiseRejectionEvent('eventType', { cancelable: true }).cancelable, true);
 
   // promise is passed.
+  var p = new Promise(function(resolve, reject) {});
   assert_equals(new PromiseRejectionEvent('eventType', { promise: p }).promise, p);
 
   // reason is passed.
   var r = new Error();
-  assert_equals(new PromiseRejectionEvent('eventType', { promise: p, reason: r }).reason, r);
+  assert_equals(new PromiseRejectionEvent('eventType', { reason: r }).reason, r);
 
 
   // All initializers are passed.