[Oilpan] Apply RefCountedGarbageCollectedEventTarget on AbstractWorker

Source/core/workers/AbstractWorker.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 55 matching lines @@
     if (executionContext()->contentSecurityPolicy() && !executionContext()->contentSecurityPolicy()->allowWorkerContextFromSource(scriptURL)) {
         exceptionState.throwSecurityError("Access to the script at '" + scriptURL.elidedString() + "' is denied by the document's Content Security Policy.");
         return KURL();
     }
 
     return scriptURL;
 }
 
 DEFINE_TRACE(AbstractWorker)
 {
-    EventTargetWithInlineData::trace(visitor);
+    RefCountedGarbageCollectedEventTargetWithInlineData<AbstractWorker>::trace(visitor);
     ActiveDOMObject::trace(visitor);
 }
 
 } // namespace blink