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

core/events/PromiseRejectionEvent.idl

Index: core/events/PromiseRejectionEvent.idl
diff --git a/core/events/PromiseRejectionEvent.idl b/core/events/PromiseRejectionEvent.idl
index 85ebeec12dedbaf42aff3a662f38ad05b5bcff75..6cb2adf74a4697312f9e10fa75203317bb1362b4 100644
--- a/core/events/PromiseRejectionEvent.idl
+++ b/core/events/PromiseRejectionEvent.idl
@@ -7,10 +7,10 @@
 [
     RuntimeEnabled=PromiseRejectionEvent,
     Custom=VisitDOMWrapper,
-    Constructor(DOMString type, optional PromiseRejectionEventInit eventInitDict),
+    Constructor(DOMString type, PromiseRejectionEventInit eventInitDict),
     ConstructorCallWith=ScriptState,
-    Exposed=(Window,Worker,ServiceWorker),
+    Exposed=(Window,Worker),
 ] interface PromiseRejectionEvent : Event {
-    [Custom=Getter] readonly attribute Promise<any>? promise;
+    [Custom=Getter] readonly attribute Promise<any> promise;
     [CallWith=ScriptState] readonly attribute any reason;
 };