Kill dead IFWL_*::Initialize() variants dead.

xfa/src/fwl/src/lightwidget/tooltipctrl.cpp

Index: xfa/src/fwl/src/lightwidget/tooltipctrl.cpp
diff --git a/xfa/src/fwl/src/lightwidget/tooltipctrl.cpp b/xfa/src/fwl/src/lightwidget/tooltipctrl.cpp
index 527f9aac9e629df8a8dadd573f9d770487542709..a167148b466131141aff458f0274e3ac25481616 100644
--- a/xfa/src/fwl/src/lightwidget/tooltipctrl.cpp
+++ b/xfa/src/fwl/src/lightwidget/tooltipctrl.cpp
@@ -33,7 +33,7 @@ FWL_ERR CFWL_ToolTip::Initialize(const CFWL_WidgetProperties* pProperties) {
   }
   prop.m_rtWidget = m_pProperties->m_rtWidget;
   m_pIface = IFWL_ToolTip::Create();
-  FWL_ERR ret = ((IFWL_ToolTip*)m_pIface)->Initialize(prop);
+  FWL_ERR ret = ((IFWL_ToolTip*)m_pIface)->Initialize(prop, nullptr);
   if (ret == FWL_ERR_Succeeded) {
     CFWL_Widget::Initialize();
   }