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

Source/core/frame/FrameView.cpp

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Dirk Mueller <mueller@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *           (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
@@ skipping 2252 matching lines @@
         return;
     }
 
     bool horizontalOverflowChanged = (m_horizontalOverflow != horizontalOverflow);
     bool verticalOverflowChanged = (m_verticalOverflow != verticalOverflow);
 
     if (horizontalOverflowChanged || verticalOverflowChanged) {
         m_horizontalOverflow = horizontalOverflow;
         m_verticalOverflow = verticalOverflow;
 
-        RefPtr<OverflowEvent> event = OverflowEvent::create(horizontalOverflowChanged, horizontalOverflow, verticalOverflowChanged, verticalOverflow);
+        RefPtrWillBeRawPtr<OverflowEvent> event = OverflowEvent::create(horizontalOverflowChanged, horizontalOverflow, verticalOverflowChanged, verticalOverflow);
         event->setTarget(m_viewportRenderer->node());
         m_frame->document()->enqueueAnimationFrameEvent(event.release());
     }
 
 }
 
 IntRect FrameView::windowClipRect(IncludeScrollbarsInRect scrollbarInclusion) const
 {
     ASSERT(m_frame->view() == this);
 
@@ skipping 962 matching lines @@
 void FrameView::willRemoveScrollbar(Scrollbar* scrollbar, ScrollbarOrientation orientation)
 {
     ScrollableArea::willRemoveScrollbar(scrollbar, orientation);
     if (AXObjectCache* cache = axObjectCache()) {
         cache->remove(scrollbar);
         cache->handleScrollbarUpdate(this);
     }
 }
 
 } // namespace WebCore