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

Source/core/loader/appcache/ApplicationCacheHost.cpp

 /*
  * 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 198 matching lines @@
         dispatchDOMEvent(deferred.eventID, deferred.progressTotal, deferred.progressDone, deferred.errorReason, deferred.errorURL, deferred.errorStatus, deferred.errorMessage);
     }
     m_deferredEvents.clear();
     m_defersEvents = false;
 }
 
 void ApplicationCacheHost::dispatchDOMEvent(EventID id, int progressTotal, int progressDone, blink::WebApplicationCacheHost::ErrorReason errorReason, const String& errorURL, int errorStatus, const String& errorMessage)
 {
     if (m_domApplicationCache) {
         const AtomicString& eventType = ApplicationCache::toEventType(id);
-        RefPtr<Event> event;
+        RefPtrWillBeRawPtr<Event> event = nullptr;
         if (id == PROGRESS_EVENT)
             event = ProgressEvent::create(eventType, true, progressDone, progressTotal);
         else if (id == ERROR_EVENT)
             event = ApplicationCacheErrorEvent::create(errorReason, errorURL, errorStatus, errorMessage);
         else
             event = Event::create(eventType);
         m_domApplicationCache->dispatchEvent(event, ASSERT_NO_EXCEPTION);
     }
 }
 
@@ skipping 41 matching lines @@
 {
     notifyApplicationCache(PROGRESS_EVENT, progressTotal, progressDone, blink::WebApplicationCacheHost::UnknownError, String(), 0, String());
 }
 
 void ApplicationCacheHost::notifyErrorEventListener(blink::WebApplicationCacheHost::ErrorReason reason, const blink::WebURL& url, int status, const blink::WebString& message)
 {
     notifyApplicationCache(ERROR_EVENT, 0, 0, reason, url.string(), status, message);
 }
 
 } // namespace WebCore