Convert XFA_ELEMENT to an enum class

xfa/fxfa/parser/cxfa_value.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_VALUE_H_
 #define XFA_FXFA_PARSER_CXFA_VALUE_H_
 
 #include "core/fxcrt/include/fx_string.h"
 #include "xfa/fxfa/parser/cxfa_arc.h"
 #include "xfa/fxfa/parser/cxfa_data.h"
 #include "xfa/fxfa/parser/cxfa_exdata.h"
 #include "xfa/fxfa/parser/cxfa_image.h"
 #include "xfa/fxfa/parser/cxfa_line.h"
 #include "xfa/fxfa/parser/cxfa_rectangle.h"
 #include "xfa/fxfa/parser/cxfa_text.h"
 
 class CXFA_Node;
 
 class CXFA_Value : public CXFA_Data {
  public:
   explicit CXFA_Value(CXFA_Node* pNode) : CXFA_Data(pNode) {}
 
-  XFA_ELEMENT GetChildValueClassID();
+  XFA_Element GetChildValueClassID();
   FX_BOOL GetChildValueContent(CFX_WideString& wsContent);
   CXFA_Arc GetArc();
   CXFA_Line GetLine();
   CXFA_Rectangle GetRectangle();
   CXFA_Text GetText();
   CXFA_ExData GetExData();
   CXFA_Image GetImage();
 };
 
 #endif  // XFA_FXFA_PARSER_CXFA_VALUE_H_