Convert XFA_ELEMENT to an enum class

xfa/fxfa/parser/cxfa_value.cpp

 // 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
 
 #include "xfa/fxfa/parser/cxfa_value.h"
 
 #include "xfa/fxfa/parser/xfa_object.h"
 
-XFA_ELEMENT CXFA_Value::GetChildValueClassID() {
+XFA_Element CXFA_Value::GetChildValueClassID() {
   if (!m_pNode)
-    return XFA_ELEMENT_UNKNOWN;
+    return XFA_Element::Unknown;
   if (CXFA_Node* pNode = m_pNode->GetNodeItem(XFA_NODEITEM_FirstChild))
     return pNode->GetClassID();
-  return XFA_ELEMENT_UNKNOWN;
+  return XFA_Element::Unknown;
 }
 
 FX_BOOL CXFA_Value::GetChildValueContent(CFX_WideString& wsContent) {
   if (!m_pNode)
     return FALSE;
   if (CXFA_Node* pNode = m_pNode->GetNodeItem(XFA_NODEITEM_FirstChild))
     return pNode->TryContent(wsContent);
   return FALSE;
 }
 
@@ skipping 20 matching lines @@
 CXFA_ExData CXFA_Value::GetExData() {
   return CXFA_ExData(m_pNode ? m_pNode->GetNodeItem(XFA_NODEITEM_FirstChild)
                              : nullptr);
 }
 
 CXFA_Image CXFA_Value::GetImage() {
   return CXFA_Image(
       m_pNode ? (m_pNode->GetNodeItem(XFA_NODEITEM_FirstChild)) : nullptr,
       TRUE);
 }