ExtendableEvent and InstallEvent should have an EventConstructor

Source/modules/serviceworkers/ExtendableEvent.h

 /*
  * Copyright (C) 2014 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 20 matching lines @@
 #ifndef ExtendableEvent_h
 #define ExtendableEvent_h
 
 #include "bindings/core/v8/ScriptValue.h"
 #include "modules/EventModules.h"
 
 namespace blink {
 
 class WaitUntilObserver;
 
+using ExtendableEventInit = EventInit;
+
 class ExtendableEvent : public Event {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static PassRefPtrWillBeRawPtr<ExtendableEvent> create();
-    static PassRefPtrWillBeRawPtr<ExtendableEvent> create(const AtomicString& type, const EventInit&, WaitUntilObserver*);
+    static PassRefPtrWillBeRawPtr<ExtendableEvent> create(const AtomicString& type, const ExtendableEventInit&);
+    static PassRefPtrWillBeRawPtr<ExtendableEvent> create(const AtomicString& type, const ExtendableEventInit&, WaitUntilObserver*);
 
     virtual ~ExtendableEvent();
 
     void waitUntil(ScriptState*, const ScriptValue&);
 
     virtual const AtomicString& interfaceName() const override;
     virtual void trace(Visitor*) override;
 
 protected:
     ExtendableEvent();
-    ExtendableEvent(const AtomicString& type, const EventInit&, WaitUntilObserver*);
+    ExtendableEvent(const AtomicString& type, const ExtendableEventInit&);
+    ExtendableEvent(const AtomicString& type, const ExtendableEventInit&, WaitUntilObserver*);
 
     PersistentWillBeMember<WaitUntilObserver> m_observer;
 };
 
 } // namespace blink
 
 #endif // ExtendableEvent_h