[bindings] Make all CustomEvent.initCustomEvent arguments non-optional and remove custom binding.

Source/core/events/CustomEvent.h

 /*
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 31 matching lines @@
     static PassRefPtrWillBeRawPtr<CustomEvent> create()
     {
         return adoptRefWillBeNoop(new CustomEvent);
     }
 
     static PassRefPtrWillBeRawPtr<CustomEvent> create(const AtomicString& type, const CustomEventInit& initializer)
     {
         return adoptRefWillBeNoop(new CustomEvent(type, initializer));
     }
 
+    void initCustomEvent(const AtomicString& type, bool canBubble, bool cancelable, const ScriptValue& detail);
     void initCustomEvent(const AtomicString& type, bool canBubble, bool cancelable, PassRefPtr<SerializedScriptValue>);
 
     const AtomicString& interfaceName() const override;
 
     SerializedScriptValue* serializedDetail() { return m_serializedDetail.get(); }
 
     ScriptValue detail() const { return m_detail; }
-    void setDetail(ScriptValue detail) { m_detail = detail; }
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     CustomEvent();
     CustomEvent(const AtomicString& type, const CustomEventInit& initializer);
 
     ScriptValue m_detail;
     RefPtr<SerializedScriptValue> m_serializedDetail;
 };
 
 } // namespace blink
 
 #endif // CustomEvent_h