Convert XFA_ELEMENT to an enum class

xfa/fxfa/app/xfa_ffdochandler.cpp

 // Copyright 2014 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/include/xfa_ffdochandler.h"
 
 #include "xfa/fxfa/include/xfa_checksum.h"
 #include "xfa/fxfa/include/xfa_ffdoc.h"
@@ skipping 17 matching lines @@
 
 XFA_ATTRIBUTEENUM CXFA_FFDocHandler::GetRestoreState(CXFA_FFDoc* hDoc) {
   CXFA_Document* pXFADoc = hDoc->GetXFADoc();
   if (!pXFADoc)
     return XFA_ATTRIBUTEENUM_Unknown;
 
   CXFA_Node* pForm = ToNode(pXFADoc->GetXFAObject(XFA_HASHCODE_Form));
   if (!pForm)
     return XFA_ATTRIBUTEENUM_Unknown;
 
-  CXFA_Node* pSubForm = pForm->GetFirstChildByClass(XFA_ELEMENT_Subform);
+  CXFA_Node* pSubForm = pForm->GetFirstChildByClass(XFA_Element::Subform);
   if (!pSubForm)
     return XFA_ATTRIBUTEENUM_Unknown;
   return pSubForm->GetEnum(XFA_ATTRIBUTE_RestoreState);
 }
 
 FX_BOOL CXFA_FFDocHandler::RunDocScript(CXFA_FFDoc* hDoc,
                                         XFA_SCRIPTTYPE eScriptType,
                                         const CFX_WideStringC& wsScript,
                                         CFXJSE_Value* pRetValue,
                                         CFXJSE_Value* pThisValue) {
   CXFA_Document* pXFADoc = hDoc->GetXFADoc();
   if (!pXFADoc)
     return FALSE;
 
   CXFA_ScriptContext* pScriptContext = pXFADoc->GetScriptContext();
   if (!pScriptContext)
     return FALSE;
 
   return pScriptContext->RunScript(
       (XFA_SCRIPTLANGTYPE)eScriptType, wsScript, pRetValue,
       pThisValue ? CXFA_ScriptContext::ToObject(pThisValue, nullptr) : nullptr);
 }