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

Source/core/loader/FrameLoadRequest.h

Index: Source/core/loader/FrameLoadRequest.h
diff --git a/Source/core/loader/FrameLoadRequest.h b/Source/core/loader/FrameLoadRequest.h
index 5b29d4d7db35031986baab0bfd4b0febfd853f38..cce34bcb7616aa02fafb43efed5324d1a4c34c52 100644
--- a/Source/core/loader/FrameLoadRequest.h
+++ b/Source/core/loader/FrameLoadRequest.h
@@ -92,7 +92,7 @@ public:
     void setClientRedirect(ClientRedirectPolicy clientRedirect) { m_clientRedirect = clientRedirect; }
 
     Event* triggeringEvent() const { return m_triggeringEvent.get(); }
-    void setTriggeringEvent(PassRefPtr<Event> triggeringEvent) { m_triggeringEvent = triggeringEvent; }
+    void setTriggeringEvent(PassRefPtrWillBeRawPtr<Event> triggeringEvent) { m_triggeringEvent = triggeringEvent; }
 
     FormState* formState() const { return m_formState.get(); }
     void setFormState(PassRefPtr<FormState> formState) { m_formState = formState; }
@@ -107,7 +107,7 @@ private:
     SubstituteData m_substituteData;
     bool m_lockBackForwardList;
     ClientRedirectPolicy m_clientRedirect;
-    RefPtr<Event> m_triggeringEvent;
+    RefPtrWillBePersistent<Event> m_triggeringEvent;
     RefPtr<FormState> m_formState;
     ShouldSendReferrer m_shouldSendReferrer;
 };