From 68e49f6d48f94bd87342ba4ba717fbe0a9a1c1cf Mon Sep 17 00:00:00 2001
From: Nathan Froyd <froydnj@gmail.com>
Date: Tue, 5 Jul 2016 18:49:06 -0400
Subject: [PATCH] Bug 1283617 - remove QI call when constructing
 AsyncEventDispatchers from WidgetEvents; r=baku

The compiler can just as easily do this cast for us; we don't have to
rely on QI, and doing the conversion this way even saves an
AddRef/Release pair.
---
 dom/events/AsyncEventDispatcher.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dom/events/AsyncEventDispatcher.cpp b/dom/events/AsyncEventDispatcher.cpp
index 43cd09443c1f..10c46273bda7 100644
--- a/dom/events/AsyncEventDispatcher.cpp
+++ b/dom/events/AsyncEventDispatcher.cpp
@@ -27,7 +27,7 @@ AsyncEventDispatcher::AsyncEventDispatcher(EventTarget* aTarget,
   MOZ_ASSERT(mTarget);
   RefPtr<Event> event =
     EventDispatcher::CreateEvent(aTarget, nullptr, &aEvent, EmptyString());
-  mEvent = do_QueryInterface(event);
+  mEvent = event.forget();
   NS_ASSERTION(mEvent, "Should never fail to create an event");
   mEvent->DuplicatePrivateData();
   mEvent->SetTrusted(aEvent.IsTrusted());