Rework dispatchEvent so it is consistent for isTrusted support.

Source/modules/notifications/Notification.cpp

Index: Source/modules/notifications/Notification.cpp
diff --git a/Source/modules/notifications/Notification.cpp b/Source/modules/notifications/Notification.cpp
index 72638ba4ea829c4cdff4694510ce411116331894..1e30c15b6892c1bbb7ce60820bc7bc6102a81baf 100644
--- a/Source/modules/notifications/Notification.cpp
+++ b/Source/modules/notifications/Notification.cpp
@@ -294,10 +294,10 @@ void Notification::requestPermission(ExecutionContext* context, NotificationPerm
         permissionClient->requestPermission(context, callback);
 }
 
-bool Notification::dispatchEvent(PassRefPtrWillBeRawPtr<Event> event)
+bool Notification::dispatchEventInternal(PassRefPtrWillBeRawPtr<Event> event)
 {
     ASSERT(executionContext()->isContextThread());
-    return EventTarget::dispatchEvent(event);
+    return EventTarget::dispatchEventInternal(event);
 }
 
 const AtomicString& Notification::interfaceName() const