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

Source/bindings/v8/SerializedScriptValue.cpp

 /*
  * Copyright (C) 2010 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 2754 matching lines @@
         Vector<RefPtr<DOMWrapperWorld> > worlds;
         DOMWrapperWorld::allWorldsInMainThread(worlds);
         for (size_t i = 0; i < worlds.size(); i++) {
             v8::Handle<v8::Object> wrapper = worlds[i]->domDataStore().get<V8ArrayBuffer>(object, isolate);
             if (!wrapper.IsEmpty()) {
                 ASSERT(wrapper->IsArrayBuffer());
                 v8::Handle<v8::ArrayBuffer>::Cast(wrapper)->Neuter();
             }
         }
     } else {
-        v8::Handle<v8::Object> wrapper = DOMDataStore::current(isolate).get<V8ArrayBuffer>(object, isolate);
+        v8::Handle<v8::Object> wrapper = DOMWrapperWorld::current(isolate)->domDataStore().get<V8ArrayBuffer>(object, isolate);
         if (!wrapper.IsEmpty()) {
             ASSERT(wrapper->IsArrayBuffer());
             v8::Handle<v8::ArrayBuffer>::Cast(wrapper)->Neuter();
         }
     }
 }
 
 PassOwnPtr<SerializedScriptValue::ArrayBufferContentsArray> SerializedScriptValue::transferArrayBuffers(ArrayBufferArray& arrayBuffers, ExceptionState& exceptionState, v8::Isolate* isolate)
 {
     ASSERT(arrayBuffers.size());
@@ skipping 153 matching lines @@
     // If the allocated memory was not registered before, then this class is likely
     // used in a context other then Worker's onmessage environment and the presence of
     // current v8 context is not guaranteed. Avoid calling v8 then.
     if (m_externallyAllocatedMemory) {
         ASSERT(v8::Isolate::GetCurrent());
         v8::Isolate::GetCurrent()->AdjustAmountOfExternalAllocatedMemory(-m_externallyAllocatedMemory);
     }
 }
 
 } // namespace WebCore