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

Source/core/loader/NavigationAction.h

Index: Source/core/loader/NavigationAction.h
diff --git a/Source/core/loader/NavigationAction.h b/Source/core/loader/NavigationAction.h
index 54e6bd7ea23a7293c8b0cf9a85c5153ecbae551e..2b1994976177c4eebf9a5757c79408f3f8f2abff 100644
--- a/Source/core/loader/NavigationAction.h
+++ b/Source/core/loader/NavigationAction.h
@@ -42,7 +42,7 @@ namespace WebCore {
     class NavigationAction {
     public:
         NavigationAction();
-        NavigationAction(const ResourceRequest&, FrameLoadType = FrameLoadTypeStandard, bool isFormSubmission = false, PassRefPtr<Event> = nullptr);
+        NavigationAction(const ResourceRequest&, FrameLoadType = FrameLoadTypeStandard, bool isFormSubmission = false, PassRefPtrWillBeRawPtr<Event> = nullptr);
 
         const ResourceRequest& resourceRequest() const { return m_resourceRequest; }
         NavigationType type() const { return m_type; }