Cleanup IFWL_Widget visibility and virtual parameters

xfa/fwl/core/cfwl_datetimepicker.cpp

Index: xfa/fwl/core/cfwl_datetimepicker.cpp
diff --git a/xfa/fwl/core/cfwl_datetimepicker.cpp b/xfa/fwl/core/cfwl_datetimepicker.cpp
index 554a16b258fc591fa9cdb95d8f4526732a779a74..fb4a39fe35c7bfccfc75de0f7b972ea7adad9a5b 100644
--- a/xfa/fwl/core/cfwl_datetimepicker.cpp
+++ b/xfa/fwl/core/cfwl_datetimepicker.cpp
@@ -148,8 +148,8 @@ FWL_Error CFWL_DateTimePicker::SetEditLimit(int32_t nLimit) {
   return ToDateTimePicker(GetWidget())->SetEditLimit(nLimit);
 }
 
-FWL_Error CFWL_DateTimePicker::ModifyEditStylesEx(uint32_t dwStylesExAdded,
-                                                  uint32_t dwStylesExRemoved) {
-  return ToDateTimePicker(GetWidget())
+void CFWL_DateTimePicker::ModifyEditStylesEx(uint32_t dwStylesExAdded,
+                                             uint32_t dwStylesExRemoved) {
+  ToDateTimePicker(GetWidget())
       ->ModifyEditStylesEx(dwStylesExAdded, dwStylesExRemoved);
 }