Add missing USED_FROM_MULTIPLE_THREADS(IDBVersionChangeEvent) decl.

Source/heap/ThreadState.h

 /*
  * Copyright (C) 2013 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 538 matching lines @@
 // FIXME: Move these macros and other related structures to a separate file.
 USED_FROM_MULTIPLE_THREADS(CloseEvent);
 USED_FROM_MULTIPLE_THREADS(Crypto);
 USED_FROM_MULTIPLE_THREADS(DOMParser);
 USED_FROM_MULTIPLE_THREADS(DOMURL);
 USED_FROM_MULTIPLE_THREADS(DeprecatedStorageQuota);
 USED_FROM_MULTIPLE_THREADS(ErrorEvent);
 USED_FROM_MULTIPLE_THREADS(Event);
 USED_FROM_MULTIPLE_THREADS(EventSource);
 USED_FROM_MULTIPLE_THREADS(EventTarget);
+USED_FROM_MULTIPLE_THREADS(IDBVersionChangeEvent);
 USED_FROM_MULTIPLE_THREADS(Key);
 USED_FROM_MULTIPLE_THREADS(KeyAlgorithm);
 USED_FROM_MULTIPLE_THREADS(KeyPair);
 USED_FROM_MULTIPLE_THREADS(MemoryInfo);
 USED_FROM_MULTIPLE_THREADS(MessageEvent);
 USED_FROM_MULTIPLE_THREADS(Notification);
 USED_FROM_MULTIPLE_THREADS(NotificationCenter);
 USED_FROM_MULTIPLE_THREADS(Performance);
 USED_FROM_MULTIPLE_THREADS(PerformanceEntry);
 USED_FROM_MULTIPLE_THREADS(PerformanceMark);
@@ skipping 13 matching lines @@
 USED_FROM_MULTIPLE_THREADS(XMLSerializer);
 USED_FROM_MULTIPLE_THREADS(XPathEvaluator);
 USED_FROM_MULTIPLE_THREADS(XPathExpression);
 USED_FROM_MULTIPLE_THREADS(XPathNSResolver);
 USED_FROM_MULTIPLE_THREADS(XPathResult);
 USED_FROM_MULTIPLE_THREADS(XSLTProcessor);
 
 }
 
 #endif // ThreadState_h