Convert XFA_ELEMENT to an enum class

xfa/fxfa/parser/cxfa_event.h

 // Copyright 2016 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #ifndef XFA_FXFA_PARSER_CXFA_EVENT_H_
 #define XFA_FXFA_PARSER_CXFA_EVENT_H_
 
 #include <stdint.h>
 
 #include "core/fxcrt/include/fx_string.h"
 #include "xfa/fxfa/parser/cxfa_data.h"
 #include "xfa/fxfa/parser/cxfa_script.h"
 #include "xfa/fxfa/parser/cxfa_submit.h"
 
 class CXFA_Node;
 
 class CXFA_Event : public CXFA_Data {
  public:
   explicit CXFA_Event(CXFA_Node* pNode);
 
   int32_t GetActivity();
-  int32_t GetEventType();
+  XFA_Element GetEventType();
   void GetRef(CFX_WideStringC& wsRef);
 
   CXFA_Script GetScript();
   CXFA_Submit GetSubmit();
 
   void GetSignDataTarget(CFX_WideString& wsTarget);
 };
 
 #endif  // XFA_FXFA_PARSER_CXFA_EVENT_H_