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

Source/bindings/v8/custom/V8ArrayBufferCustom.h

 /*
  * Copyright (C) 2012 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:
  * 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 90 matching lines @@
     }
     if (DOMDataStore::setReturnValueFromWrapper<V8ArrayBuffer>(info.GetReturnValue(), impl))
         return;
     v8::Handle<v8::Object> wrapper = wrap(impl, info.Holder(), info.GetIsolate());
     v8SetReturnValue(info, wrapper);
 }
 
 template<class CallbackInfo>
 inline void v8SetReturnValueForMainWorld(const CallbackInfo& info, ArrayBuffer* impl)
 {
-    ASSERT(DOMWrapperWorld::current(info.GetIsolate()).isMainWorld());
+    ASSERT(DOMWrapperWorld::current(info.GetIsolate())->isMainWorld());
     if (UNLIKELY(!impl)) {
         v8SetReturnValueNull(info);
         return;
     }
     if (DOMDataStore::setReturnValueFromWrapperForMainWorld<V8ArrayBuffer>(info.GetReturnValue(), impl))
         return;
     v8::Handle<v8::Value> wrapper = wrap(impl, info.Holder(), info.GetIsolate());
     v8SetReturnValue(info, wrapper);
 }
 
@@ skipping 29 matching lines @@
 
 template<class CallbackInfo, class Wrappable>
 inline void v8SetReturnValueFast(const CallbackInfo& info, PassRefPtr< ArrayBuffer > impl, Wrappable* wrappable)
 {
     v8SetReturnValueFast(info, impl.get(), wrappable);
 }
 
 } // namespace WebCore
 
 #endif // V8ArrayBufferCustom_h