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

Source/core/loader/NavigationAction.cpp

 /*
  * Copyright (C) 2006 Apple Computer, 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 37 matching lines @@
         return NavigationTypeBackForward;
     return NavigationTypeOther;
 }
 
 NavigationAction::NavigationAction()
     : m_type(NavigationTypeOther)
 {
 }
 
 NavigationAction::NavigationAction(const ResourceRequest& resourceRequest, FrameLoadType frameLoadType,
-    bool isFormSubmission, PassRefPtr<Event> passEvent)
+    bool isFormSubmission, PassRefPtrWillBeRawPtr<Event> passEvent)
     : m_resourceRequest(resourceRequest)
 {
-    RefPtr<Event> event = passEvent;
+    RefPtrWillBeRawPtr<Event> event = passEvent;
     m_type = navigationType(frameLoadType, isFormSubmission || resourceRequest.httpBody(), event);
     m_eventTimeStamp = event ? event->timeStamp() : 0;
 
     const MouseEvent* mouseEvent = 0;
     if (m_type == NavigationTypeLinkClicked) {
         ASSERT(event);
         if (event->isMouseEvent())
             mouseEvent = toMouseEvent(event.get());
     } else if (m_type == NavigationTypeFormSubmitted && event && event->underlyingEvent() && event->underlyingEvent()->isMouseEvent()) {
         mouseEvent = toMouseEvent(event->underlyingEvent());
     }
 
     if (!mouseEvent || !navigationPolicyFromMouseEvent(mouseEvent->button(), mouseEvent->ctrlKey(), mouseEvent->shiftKey(), mouseEvent->altKey(), mouseEvent->metaKey(), &m_policy))
         m_policy = NavigationPolicyCurrentTab;
 }
 
 }