Oilpan: Replace most of RefPtrs for Event objects with oilpan's transition types

Source/core/workers/WorkerGlobalScope.cpp

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  * Copyright (C) 2009, 2011 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 218 matching lines @@
         scriptLoader->loadSynchronously(executionContext(), *it, AllowCrossOriginRequests);
 
         // If the fetching attempt failed, throw a NetworkError exception and abort all these steps.
         if (scriptLoader->failed()) {
             exceptionState.throwDOMException(NetworkError, "The script at '" + it->elidedString() + "' failed to load.");
             return;
         }
 
         InspectorInstrumentation::scriptImported(executionContext(), scriptLoader->identifier(), scriptLoader->script());
 
-        RefPtr<ErrorEvent> errorEvent;
+        RefPtrWillBeRawPtr<ErrorEvent> errorEvent = nullptr;

[haraken, 2014/04/03 10:39:31]

This '= nullptr' was necessary.

         m_script->evaluate(ScriptSourceCode(scriptLoader->script(), scriptLoader->responseURL()), &errorEvent);
         if (errorEvent) {
             m_script->rethrowExceptionFromImportedScript(errorEvent.release());
             return;
         }
     }
 }
 
 EventTarget* WorkerGlobalScope::errorEventTarget()
 {
@@ skipping 53 matching lines @@
 {
     visitor->trace(m_console);
     visitor->trace(m_location);
     visitor->trace(m_navigator);
 #if ENABLE(OILPAN)
     HeapSupplementable<WorkerGlobalScope>::trace(visitor);
 #endif
 }
 
 } // namespace WebCore