Roll 50: Copied IDLs, PYTHON scripts from WebKit removed deleted files in WebCore

modules/notifications/NotificationEvent.idl

Index: modules/notifications/NotificationEvent.idl
diff --git a/modules/notifications/NotificationEvent.idl b/modules/notifications/NotificationEvent.idl
index 89bc93f185a7b4ceacf3f594360597da1ef8e5c8..426177773d52febd117c523342f7686bdbd69717 100644
--- a/modules/notifications/NotificationEvent.idl
+++ b/modules/notifications/NotificationEvent.idl
@@ -5,10 +5,10 @@
 // https://notifications.spec.whatwg.org/#service-worker-api
 
 [
-    Constructor(DOMString type, optional NotificationEventInit eventInitDict),
+    Constructor(DOMString type, NotificationEventInit eventInitDict),
     Exposed=ServiceWorker,
-    RuntimeEnabled=ServiceWorkerNotifications,
-    TypeChecking=Interface,
+    RuntimeEnabled=Notifications,
 ] interface NotificationEvent : ExtendableEvent {
     readonly attribute Notification notification;
+    readonly attribute DOMString action;
 };