Convert FWL_ERR into an enum class.

xfa/fxfa/app/xfa_ffchoicelist.cpp

Index: xfa/fxfa/app/xfa_ffchoicelist.cpp
diff --git a/xfa/fxfa/app/xfa_ffchoicelist.cpp b/xfa/fxfa/app/xfa_ffchoicelist.cpp
index 6bb7c0bedbd837495fc300ccc421263cbe3948ea..86cce267f5d0d96f7e74f9cd9f643c2856342404 100644
--- a/xfa/fxfa/app/xfa_ffchoicelist.cpp
+++ b/xfa/fxfa/app/xfa_ffchoicelist.cpp
@@ -183,7 +183,7 @@ void CXFA_FFListBox::DeleteItem(int32_t nIndex) {
 int32_t CXFA_FFListBox::OnProcessMessage(CFWL_Message* pMessage) {
   return m_pOldDelegate->OnProcessMessage(pMessage);
 }
-FWL_ERR CXFA_FFListBox::OnProcessEvent(CFWL_Event* pEvent) {
+FWL_Error CXFA_FFListBox::OnProcessEvent(CFWL_Event* pEvent) {
   CXFA_FFField::OnProcessEvent(pEvent);
   switch (pEvent->GetClassID()) {
     case CFWL_EventType::SelectChanged: {
@@ -196,8 +196,8 @@ FWL_ERR CXFA_FFListBox::OnProcessEvent(CFWL_Event* pEvent) {
   }
   return m_pOldDelegate->OnProcessEvent(pEvent);
 }
-FWL_ERR CXFA_FFListBox::OnDrawWidget(CFX_Graphics* pGraphics,
-                                     const CFX_Matrix* pMatrix) {
+FWL_Error CXFA_FFListBox::OnDrawWidget(CFX_Graphics* pGraphics,
+                                       const CFX_Matrix* pMatrix) {
   return m_pOldDelegate->OnDrawWidget(pGraphics, pMatrix);
 }
 
@@ -499,7 +499,7 @@ int32_t CXFA_FFComboBox::OnProcessMessage(CFWL_Message* pMessage) {
   return m_pOldDelegate->OnProcessMessage(pMessage);
 }
 
-FWL_ERR CXFA_FFComboBox::OnProcessEvent(CFWL_Event* pEvent) {
+FWL_Error CXFA_FFComboBox::OnProcessEvent(CFWL_Event* pEvent) {
   CXFA_FFField::OnProcessEvent(pEvent);
   switch (pEvent->GetClassID()) {
     case CFWL_EventType::SelectChanged: {
@@ -527,7 +527,7 @@ FWL_ERR CXFA_FFComboBox::OnProcessEvent(CFWL_Event* pEvent) {
   return m_pOldDelegate->OnProcessEvent(pEvent);
 }
 
-FWL_ERR CXFA_FFComboBox::OnDrawWidget(CFX_Graphics* pGraphics,
-                                      const CFX_Matrix* pMatrix) {
+FWL_Error CXFA_FFComboBox::OnDrawWidget(CFX_Graphics* pGraphics,
+                                        const CFX_Matrix* pMatrix) {
   return m_pOldDelegate->OnDrawWidget(pGraphics, pMatrix);
 }