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

Source/core/frame/FrameView.cpp

Index: Source/core/frame/FrameView.cpp
diff --git a/Source/core/frame/FrameView.cpp b/Source/core/frame/FrameView.cpp
index 4f3eaea6005ecfca628f84b3635650c5110a00a0..c1a49cdb841421a02d390bfd6805796d12b3266d 100644
--- a/Source/core/frame/FrameView.cpp
+++ b/Source/core/frame/FrameView.cpp
@@ -2270,7 +2270,7 @@ void FrameView::updateOverflowStatus(bool horizontalOverflow, bool verticalOverf
         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());
     }