Convert FWL_ERR into an enum class.

xfa/fwl/lightwidget/cfwl_widgetdelegate.cpp

Index: xfa/fwl/lightwidget/cfwl_widgetdelegate.cpp
diff --git a/xfa/fwl/lightwidget/cfwl_widgetdelegate.cpp b/xfa/fwl/lightwidget/cfwl_widgetdelegate.cpp
index 1596aba48a400e4a7373986b1c4d3f8bf520522d..0657123e88ddb5dd0e78b8419f134b78ddb321b0 100644
--- a/xfa/fwl/lightwidget/cfwl_widgetdelegate.cpp
+++ b/xfa/fwl/lightwidget/cfwl_widgetdelegate.cpp
@@ -17,11 +17,11 @@ int32_t CFWL_WidgetDelegate::OnProcessMessage(CFWL_Message* pMessage) {
   return 1;
 }
 
-FWL_ERR CFWL_WidgetDelegate::OnProcessEvent(CFWL_Event* pEvent) {
-  return FWL_ERR_Succeeded;
+FWL_Error CFWL_WidgetDelegate::OnProcessEvent(CFWL_Event* pEvent) {
+  return FWL_Error::Succeeded;
 }
 
-FWL_ERR CFWL_WidgetDelegate::OnDrawWidget(CFX_Graphics* pGraphics,
-                                          const CFX_Matrix* pMatrix) {
-  return FWL_ERR_Succeeded;
+FWL_Error CFWL_WidgetDelegate::OnDrawWidget(CFX_Graphics* pGraphics,
+                                            const CFX_Matrix* pMatrix) {
+  return FWL_Error::Succeeded;
 }