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

Source/web/WebNode.cpp

Index: Source/web/WebNode.cpp
diff --git a/Source/web/WebNode.cpp b/Source/web/WebNode.cpp
index eb3f9e9b6c07cfd9b93754349f610af24d333a70..48306bd1fb944b96ca540c26873d0329444707ee 100644
--- a/Source/web/WebNode.cpp
+++ b/Source/web/WebNode.cpp
@@ -184,7 +184,7 @@ void WebNode::addEventListener(const WebString& eventType, WebDOMEventListener*
 bool WebNode::dispatchEvent(const WebDOMEvent& event)
 {
     if (!event.isNull())
-        return m_private->dispatchEvent(event);
+        return m_private->dispatchEvent(event.getValue());
     return false;
 }