Oilpan: Remove ref counting from EventTarget and all uses of Pass/RefPtr<EventTarget>.

Source/core/xml/XMLHttpRequestUpload.h

Index: Source/core/xml/XMLHttpRequestUpload.h
diff --git a/Source/core/xml/XMLHttpRequestUpload.h b/Source/core/xml/XMLHttpRequestUpload.h
index 65e17e2bc5fdedf5f3a345d31fd10820aa2fe623..b37a0f1cb24dfdecb8c1756f9b1b414d050419f2 100644
--- a/Source/core/xml/XMLHttpRequestUpload.h
+++ b/Source/core/xml/XMLHttpRequestUpload.h
@@ -74,8 +74,10 @@ public:
 private:
     explicit XMLHttpRequestUpload(XMLHttpRequest*);
 
+#if !ENABLE(OILPAN)
     virtual void refEventTarget() OVERRIDE { ref(); }
     virtual void derefEventTarget() OVERRIDE { deref(); }
+#endif
 
     RawPtrWillBeMember<XMLHttpRequest> m_xmlHttpRequest;
     EventTargetData m_eventTargetData;