Cleanup unneeded FWL theme code.

xfa/fwl/theme/cfwl_checkboxtp.cpp

Index: xfa/fwl/theme/cfwl_checkboxtp.cpp
diff --git a/xfa/fwl/theme/cfwl_checkboxtp.cpp b/xfa/fwl/theme/cfwl_checkboxtp.cpp
index 033ee14ef3ba63d3281c8c355c58dffd81c684ac..9a96eedb0489028af121e4636a3be4bfc351e3c6 100644
--- a/xfa/fwl/theme/cfwl_checkboxtp.cpp
+++ b/xfa/fwl/theme/cfwl_checkboxtp.cpp
@@ -41,12 +41,10 @@ bool CFWL_CheckBoxTP::IsValidWidget(IFWL_Widget* pWidget) {
   return pWidget && pWidget->GetClassID() == FWL_Type::CheckBox;
 }
 
-uint32_t CFWL_CheckBoxTP::SetThemeID(IFWL_Widget* pWidget,
-                                     uint32_t dwThemeID,
-                                     FX_BOOL bChildren) {
+uint32_t CFWL_CheckBoxTP::SetThemeID(IFWL_Widget* pWidget, uint32_t dwThemeID) {
   if (m_pThemeData)
     SetThemeData(FWL_GetThemeColor(dwThemeID));
-  return CFWL_WidgetTP::SetThemeID(pWidget, dwThemeID, bChildren);
+  return CFWL_WidgetTP::SetThemeID(pWidget, dwThemeID);
 }
 
 FX_BOOL CFWL_CheckBoxTP::DrawText(CFWL_ThemeText* pParams) {