DOMDataStore should be cleared when shutting down worker threads

Source/bindings/v8/V8Binding.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 685 matching lines @@
 PassOwnPtr<V8BindingTestScope> V8BindingTestScope::create(v8::Isolate* isolate)
 {
     return adoptPtr(new V8BindingTestScope(isolate));
 }
 
 V8BindingTestScope::V8BindingTestScope(v8::Isolate* isolate)
     : m_handleScope(isolate)
     , m_context(v8::Context::New(isolate))
     , m_contextScope(m_context)
     , m_world(DOMWrapperWorld::create())
-    , m_perContextData(V8PerContextData::create(m_context, m_world.get()))
+    , m_perContextData(V8PerContextData::create(m_context, m_world))
 {
 }
 
 } // namespace WebCore