Remove leak of objects between isolated worlds on custom events.

Source/core/dom/CustomEvent.cpp

 /*
  * 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 23 matching lines @@
 {
 }
 
 CustomEvent::CustomEvent()
 {
     ScriptWrappable::init(this);
 }
 
 CustomEvent::CustomEvent(const AtomicString& type, const CustomEventInit& initializer)
     : Event(type, initializer)
-    , m_detail(initializer.detail)
 {
     ScriptWrappable::init(this);
 }
 
 CustomEvent::~CustomEvent()
 {
 }
 
-void CustomEvent::initCustomEvent(const AtomicString& type, bool canBubble, bool cancelable, const ScriptValue& detail)
+void CustomEvent::initCustomEvent(const AtomicString& type, bool canBubble, bool cancelable)
 {
     ASSERT(!m_serializedScriptValue.get());
     if (dispatched())
         return;
 
     initEvent(type, canBubble, cancelable);
-
-    m_detail = detail;
 }
 
 void CustomEvent::initCustomEvent(const AtomicString& type, bool canBubble, bool cancelable, PassRefPtr<SerializedScriptValue> serializedScriptValue)
 {
-    ASSERT(m_detail.hasNoValue());
     if (dispatched())
         return;
 
     initEvent(type, canBubble, cancelable);
 
     m_serializedScriptValue = serializedScriptValue;
 }
 
 const AtomicString& CustomEvent::interfaceName() const
 {
     return eventNames().interfaceForCustomEvent;
 }
 
 } // namespace WebCore