Convert FWL_ERR into an enum class.

xfa/fwl/theme/cfwl_edittp.cpp

Index: xfa/fwl/theme/cfwl_edittp.cpp
diff --git a/xfa/fwl/theme/cfwl_edittp.cpp b/xfa/fwl/theme/cfwl_edittp.cpp
index 8f060ee6bfe0bd3a780e3bef6f00af63e91c4bed..8ef2c3e369425779d4820f380d7330307d78dcd8 100644
--- a/xfa/fwl/theme/cfwl_edittp.cpp
+++ b/xfa/fwl/theme/cfwl_edittp.cpp
@@ -79,11 +79,11 @@ FX_BOOL CFWL_EditTP::DrawBackground(CFWL_ThemeBackground* pParams) {
   }
   return TRUE;
 }
-FWL_ERR CFWL_EditTP::Initialize() {
+FWL_Error CFWL_EditTP::Initialize() {
   InitTTO();
   return CFWL_WidgetTP::Initialize();
 }
-FWL_ERR CFWL_EditTP::Finalize() {
+FWL_Error CFWL_EditTP::Finalize() {
   FinalizeTTO();
   return CFWL_WidgetTP::Finalize();
 }