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

xfa/include/fwl/basewidget/fwl_tooltipctrl.h

Index: xfa/include/fwl/basewidget/fwl_tooltipctrl.h
diff --git a/xfa/include/fwl/basewidget/fwl_tooltipctrl.h b/xfa/include/fwl/basewidget/fwl_tooltipctrl.h
index 835f9abf11b8494fec156375b85c30b3f29b0891..2dce69383ff78abc88dbc0cbaed770945f7c354b 100644
--- a/xfa/include/fwl/basewidget/fwl_tooltipctrl.h
+++ b/xfa/include/fwl/basewidget/fwl_tooltipctrl.h
@@ -32,9 +32,8 @@ class IFWL_ToolTipDP : public IFWL_DataProvider {
 class IFWL_ToolTip : public IFWL_Form {
  public:
   static IFWL_ToolTip* Create();
-  FWL_ERR Initialize(IFWL_Widget* pOuter = NULL);
   FWL_ERR Initialize(const CFWL_WidgetImpProperties& properties,
-                     IFWL_Widget* pOuter = NULL);
+                     IFWL_Widget* pOuter);
   FWL_ERR SetAnchor(const CFX_RectF& rtAnchor);
   FWL_ERR Show();
   FWL_ERR Hide();