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

Source/web/WebDOMEvent.cpp

Index: Source/web/WebDOMEvent.cpp
diff --git a/Source/web/WebDOMEvent.cpp b/Source/web/WebDOMEvent.cpp
index eb70c33c240c55d0f2fc2835156eaa3d1197ba04..ec4ee5d1f958b681911244f80d3a7fd88aefce58 100644
--- a/Source/web/WebDOMEvent.cpp
+++ b/Source/web/WebDOMEvent.cpp
@@ -56,12 +56,12 @@ void WebDOMEvent::assign(const WTF::PassRefPtr<WebDOMEventPrivate>& event)
     m_private = event;
 }
 
-WebDOMEvent::WebDOMEvent(const WTF::PassRefPtr<WebCore::Event>& event)
+WebDOMEvent::WebDOMEvent(const PassRefPtrWillBeRawPtr<WebCore::Event>& event)
     : m_private(event)
 {
 }
 
-WebDOMEvent::operator WTF::PassRefPtr<WebCore::Event>() const
+WebDOMEvent::operator PassRefPtrWillBeRawPtr<WebCore::Event>() const
 {
     return m_private.get();
 }