Convert XFA_ELEMENT to an enum class

xfa/fxfa/parser/cxfa_data.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_data.h"
 
 #include "xfa/fxfa/parser/xfa_object.h"
 
@@ skipping 41 matching lines @@
           break;
 
         b = b * 10 + str[cc] - '0';
         cc++;
       }
     }
   }
   return (0xff << 24) | (r << 16) | (g << 8) | b;
 }
 
-XFA_ELEMENT CXFA_Data::GetClassID() const {
-  return m_pNode ? m_pNode->GetClassID() : XFA_ELEMENT_UNKNOWN;
+XFA_Element CXFA_Data::GetClassID() const {
+  return m_pNode ? m_pNode->GetClassID() : XFA_Element::Unknown;
 }
 
 FX_BOOL CXFA_Data::TryMeasure(XFA_ATTRIBUTE eAttr,
                               FX_FLOAT& fValue,
                               FX_BOOL bUseDefault) const {
   CXFA_Measurement ms;
   if (m_pNode->TryMeasure(eAttr, ms, bUseDefault)) {
     fValue = ms.ToUnit(XFA_UNIT_Pt);
     return TRUE;
   }
   return FALSE;
 }
 
 FX_BOOL CXFA_Data::SetMeasure(XFA_ATTRIBUTE eAttr, FX_FLOAT fValue) {
   CXFA_Measurement ms(fValue, XFA_UNIT_Pt);
   return m_pNode->SetMeasure(eAttr, ms);
 }