Revert of Make DOMWrapperWorld::current() return a reference instead of a pointer

Source/bindings/v8/V8AbstractEventListener.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 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 25 matching lines @@
 #include "bindings/v8/V8Binding.h"
 #include "bindings/v8/V8EventListenerList.h"
 #include "bindings/v8/V8HiddenValue.h"
 #include "core/events/BeforeUnloadEvent.h"
 #include "core/events/Event.h"
 #include "core/inspector/InspectorCounters.h"
 #include "core/workers/WorkerGlobalScope.h"
 
 namespace WebCore {
 
-V8AbstractEventListener::V8AbstractEventListener(bool isAttribute, DOMWrapperWorld& world, v8::Isolate* isolate)
+V8AbstractEventListener::V8AbstractEventListener(bool isAttribute, DOMWrapperWorld* world, v8::Isolate* isolate)
     : EventListener(JSEventListenerType)
     , m_isAttribute(isAttribute)
     , m_world(world)
     , m_isolate(isolate)
 {
     if (isMainThread())
         InspectorCounters::incrementCounter(InspectorCounters::JSEventListenerCounter);
 }
 
 V8AbstractEventListener::~V8AbstractEventListener()
@@ skipping 113 matching lines @@
 
     EventTarget* target = event->currentTarget();
     v8::Handle<v8::Value> value = toV8(target, v8::Handle<v8::Object>(), isolate);
     if (value.IsEmpty())
         return v8::Local<v8::Object>();
     return v8::Local<v8::Object>::New(isolate, v8::Handle<v8::Object>::Cast(value));
 }
 
 bool V8AbstractEventListener::belongsToTheCurrentWorld() const
 {
-    return m_isolate->InContext() && m_world == &DOMWrapperWorld::current(m_isolate);
+    return m_isolate->InContext() && m_world == DOMWrapperWorld::current(m_isolate);
 }
 
 void V8AbstractEventListener::setWeakCallback(const v8::WeakCallbackData<v8::Object, V8AbstractEventListener> &data)
 {
     data.GetParameter()->m_listener.clear();
 }
 
 } // namespace WebCore