Oilpan: update WebNotification and WebDOMMediaStreamTrack type conversions

Source/web/WebNotification.cpp

Index: Source/web/WebNotification.cpp
diff --git a/Source/web/WebNotification.cpp b/Source/web/WebNotification.cpp
index 7ba72eb71b4b92b5508067b92733f59750da53b0..58386071a4b9c4c8edf4f4cb68d4a8c3c9026057 100644
--- a/Source/web/WebNotification.cpp
+++ b/Source/web/WebNotification.cpp
@@ -114,20 +114,15 @@ void WebNotification::dispatchClickEvent()
     m_private->dispatchClickEvent();
 }
 
-WebNotification::WebNotification(const WTF::PassRefPtr<WebCore::Notification>& notification)
+WebNotification::WebNotification(const WTF::RawPtr<Notification>& notification)
     : m_private(notification)
 {
 }
 
-WebNotification& WebNotification::operator=(const WTF::PassRefPtr<Notification>& notification)
+WebNotification& WebNotification::operator=(const WTF::RawPtr<Notification>& notification)
 {
     m_private = notification;
     return *this;
 }
 
-WebNotification::operator WTF::PassRefPtr<Notification>() const
-{
-    return m_private.get();
-}
-
 } // namespace blink