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

xfa/src/fwl/src/lightwidget/picturebox.cpp

Index: xfa/src/fwl/src/lightwidget/picturebox.cpp
diff --git a/xfa/src/fwl/src/lightwidget/picturebox.cpp b/xfa/src/fwl/src/lightwidget/picturebox.cpp
index 9a6c7d6d0fb0d8d80037cfa22a5bb96206c4dc6c..bb339a82aa6347cd09ad0692d34607fa8e3bbb94 100644
--- a/xfa/src/fwl/src/lightwidget/picturebox.cpp
+++ b/xfa/src/fwl/src/lightwidget/picturebox.cpp
@@ -27,7 +27,7 @@ FWL_ERR CFWL_PictureBox::Initialize(const CFWL_WidgetProperties* pProperties) {
   }
   prop.m_rtWidget = m_pProperties->m_rtWidget;
   m_pIface = IFWL_PictureBox::Create();
-  FWL_ERR ret = ((IFWL_PictureBox*)m_pIface)->Initialize(prop);
+  FWL_ERR ret = ((IFWL_PictureBox*)m_pIface)->Initialize(prop, nullptr);
   if (ret == FWL_ERR_Succeeded) {
     CFWL_Widget::Initialize();
   }