Convert XFA_ELEMENT to an enum class

xfa/fxfa/parser/cxfa_value.cpp

Index: xfa/fxfa/parser/cxfa_value.cpp
diff --git a/xfa/fxfa/parser/cxfa_value.cpp b/xfa/fxfa/parser/cxfa_value.cpp
index 1e41ab27d325421bab7a0436c46b73d5de41781d..eac146be8a81aac1f6e5e70fb4214343c304333c 100644
--- a/xfa/fxfa/parser/cxfa_value.cpp
+++ b/xfa/fxfa/parser/cxfa_value.cpp
@@ -8,12 +8,12 @@
 
 #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) {