FWL refcounts never incremented (part 2).

xfa/include/fwl/basewidget/fwl_listbox.h

Index: xfa/include/fwl/basewidget/fwl_listbox.h
diff --git a/xfa/include/fwl/basewidget/fwl_listbox.h b/xfa/include/fwl/basewidget/fwl_listbox.h
index cc2fe91feb5d4ab8bab3990d3fd7eef4d0afbc9b..1d585881d3cfaffad2df9385e195d6de20e15ecc 100644
--- a/xfa/include/fwl/basewidget/fwl_listbox.h
+++ b/xfa/include/fwl/basewidget/fwl_listbox.h
@@ -109,10 +109,12 @@ class IFWL_ListBoxCompare {
 };
 class IFWL_ListBox : public IFWL_Widget {
  public:
-  IFWL_ListBox();
+  static IFWL_ListBox* Create(const CFWL_WidgetImpProperties& properties,
+                              IFWL_Widget* pOuter);
+  static IFWL_ListBox* CreateComboList(
+      const CFWL_WidgetImpProperties& properties,
+      IFWL_Widget* pOuter);
 
-  FWL_ERR Initialize(const CFWL_WidgetImpProperties& properties,
-                     IFWL_Widget* pOuter);
   int32_t CountSelItems();
   FWL_HLISTITEM GetSelItem(int32_t nIndexSel);
   int32_t GetSelIndex(int32_t nIndex);
@@ -120,5 +122,8 @@ class IFWL_ListBox : public IFWL_Widget {
   FWL_ERR GetItemText(FWL_HLISTITEM hItem, CFX_WideString& wsText);
   FWL_ERR GetScrollPos(FX_FLOAT& fPos, FX_BOOL bVert = TRUE);
   FWL_ERR* Sort(IFWL_ListBoxCompare* pCom);
+
+ protected:
+  IFWL_ListBox();
 };
 #endif