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

Source/core/loader/FormSubmission.h

Index: Source/core/loader/FormSubmission.h
diff --git a/Source/core/loader/FormSubmission.h b/Source/core/loader/FormSubmission.h
index 0ed026c74811b9b78bcdd2db8bcba88acf549837..43e41ec86af54dde40ed94c5f73b72fc4e0bfd30 100644
--- a/Source/core/loader/FormSubmission.h
+++ b/Source/core/loader/FormSubmission.h
@@ -32,6 +32,7 @@
 #define FormSubmission_h
 
 #include "core/loader/FormState.h"
+#include "heap/Handle.h"
 #include "platform/weborigin/KURL.h"
 #include "platform/weborigin/Referrer.h"
 
@@ -92,7 +93,7 @@ public:
         String m_acceptCharset;
     };
 
-    static PassRefPtr<FormSubmission> create(HTMLFormElement*, const Attributes&, PassRefPtr<Event> event, FormSubmissionTrigger);
+    static PassRefPtr<FormSubmission> create(HTMLFormElement*, const Attributes&, PassRefPtrWillBeRawPtr<Event>, FormSubmissionTrigger);
 
     void populateFrameLoadRequest(FrameLoadRequest&);
 
@@ -112,7 +113,7 @@ public:
     const String& result() const { return m_result; }
 
 private:
-    FormSubmission(Method, const KURL& action, const AtomicString& target, const AtomicString& contentType, PassRefPtr<FormState>, PassRefPtr<FormData>, const String& boundary, PassRefPtr<Event>);
+    FormSubmission(Method, const KURL& action, const AtomicString& target, const AtomicString& contentType, PassRefPtr<FormState>, PassRefPtr<FormData>, const String& boundary, PassRefPtrWillBeRawPtr<Event>);
     // FormSubmission for DialogMethod
     FormSubmission(const String& result);
 
@@ -124,7 +125,7 @@ private:
     RefPtr<FormState> m_formState;
     RefPtr<FormData> m_formData;
     String m_boundary;
-    RefPtr<Event> m_event;
+    RefPtrWillBePersistent<Event> m_event;
     Referrer m_referrer;
     String m_origin;
     String m_result;