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

Source/bindings/v8/custom/V8MessageEventCustom.cpp

 /*
  * Copyright (C) 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 138 matching lines @@
         portArray = adoptPtr(new MessagePortArray);
         bool success = false;
         *portArray = toRefPtrNativeArray<MessagePort, V8MessagePort>(info[portArrayIndex], portArrayIndex + 1, info.GetIsolate(), &success);
         if (!success)
             return;
     }
     event->initMessageEvent(typeArg, canBubbleArg, cancelableArg, originArg, lastEventIdArg, sourceArg, portArray.release());
 
     if (!dataArg.IsEmpty()) {
         V8HiddenValue::setHiddenValue(info.GetIsolate(), info.Holder(), V8HiddenValue::data(info.GetIsolate()), dataArg);
-        if (DOMWrapperWorld::current(info.GetIsolate())->isIsolatedWorld())
+        if (DOMWrapperWorld::current(info.GetIsolate()).isIsolatedWorld())
             event->setSerializedData(SerializedScriptValue::createAndSwallowExceptions(dataArg, info.GetIsolate()));
     }
 }
 
 void V8MessageEvent::webkitInitMessageEventMethodCustom(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     initMessageEventMethodCustom(info);
 }
 
 
 } // namespace WebCore