DOMDataStore should be cleared when shutting down worker threads

Source/core/events/ErrorEvent.h

 /*
  * 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 35 matching lines @@
     unsigned lineno;
     unsigned colno;
 };
 
 class ErrorEvent FINAL : public Event {
 public:
     static PassRefPtr<ErrorEvent> create()
     {
         return adoptRef(new ErrorEvent);
     }
-    static PassRefPtr<ErrorEvent> create(const String& message, const String& fileName, unsigned lineNumber, unsigned columnNumber, PassRefPtr<DOMWrapperWorld> world)
+    static PassRefPtr<ErrorEvent> create(const String& message, const String& fileName, unsigned lineNumber, unsigned columnNumber, DOMWrapperWorld* world)
     {
         return adoptRef(new ErrorEvent(message, fileName, lineNumber, columnNumber, world));
     }
     static PassRefPtr<ErrorEvent> create(const AtomicString& type, const ErrorEventInit& initializer)
     {
         return adoptRef(new ErrorEvent(type, initializer));
     }
-    static PassRefPtr<ErrorEvent> createSanitizedError(PassRefPtr<DOMWrapperWorld> world)
+    static PassRefPtr<ErrorEvent> createSanitizedError(DOMWrapperWorld* world)
     {
         return adoptRef(new ErrorEvent("Script error.", String(), 0, 0, world));
     }
     virtual ~ErrorEvent();
 
     // As 'message' is exposed to JavaScript, never return unsanitizedMessage.
     const String& message() const { return m_sanitizedMessage; }
     const String& filename() const { return m_fileName; }
     unsigned lineno() const { return m_lineNumber; }
     unsigned colno() const { return m_columnNumber; }
 
     // 'messageForConsole' is not exposed to JavaScript, and prefers 'm_unsanitizedMessage'.
     const String& messageForConsole() const { return !m_unsanitizedMessage.isEmpty() ? m_unsanitizedMessage : m_sanitizedMessage; }
 
     virtual const AtomicString& interfaceName() const OVERRIDE;
 
-    PassRefPtr<DOMWrapperWorld> world() const { return m_world; }
+    DOMWrapperWorld* world() const { return m_world.get(); }
 
     void setUnsanitizedMessage(const String&);
 
     virtual void trace(Visitor*) OVERRIDE;
 
 private:
     ErrorEvent();
-    ErrorEvent(const String& message, const String& fileName, unsigned lineNumber, unsigned columnNumber, PassRefPtr<DOMWrapperWorld>);
+    ErrorEvent(const String& message, const String& fileName, unsigned lineNumber, unsigned columnNumber, DOMWrapperWorld*);
     ErrorEvent(const AtomicString&, const ErrorEventInit&);
 
     String m_unsanitizedMessage;
     String m_sanitizedMessage;
     String m_fileName;
     unsigned m_lineNumber;
     unsigned m_columnNumber;
 
     RefPtr<DOMWrapperWorld> m_world;
 };
 
 } // namespace WebCore
 
 #endif // ErrorEvent_h