FWL refcounts never incremented (part 2).

xfa/include/fwl/basewidget/fwl_scrollbar.h

Index: xfa/include/fwl/basewidget/fwl_scrollbar.h
diff --git a/xfa/include/fwl/basewidget/fwl_scrollbar.h b/xfa/include/fwl/basewidget/fwl_scrollbar.h
index 10ce5f2688302ba4f32bbcd06ecc55ab67c5284e..04263a896718a74387a32e091da36596f62a90c6 100644
--- a/xfa/include/fwl/basewidget/fwl_scrollbar.h
+++ b/xfa/include/fwl/basewidget/fwl_scrollbar.h
@@ -47,9 +47,9 @@ enum FWL_SCBCODE {
 class IFWL_ScrollBarDP : public IFWL_DataProvider {};
 class IFWL_ScrollBar : public IFWL_Widget {
  public:
-  IFWL_ScrollBar();
-  FWL_ERR Initialize(const CFWL_WidgetImpProperties& properties,
-                     IFWL_Widget* pOuter);
+  static IFWL_ScrollBar* Create(const CFWL_WidgetImpProperties& properties,
+                                IFWL_Widget* pOuter);
+
   FX_BOOL IsVertical();
   FWL_ERR GetRange(FX_FLOAT& fMin, FX_FLOAT& fMax);
   FWL_ERR SetRange(FX_FLOAT fMin, FX_FLOAT fMax);
@@ -62,5 +62,8 @@ class IFWL_ScrollBar : public IFWL_Widget {
   FX_FLOAT GetTrackPos();
   FWL_ERR SetTrackPos(FX_FLOAT fTrackPos);
   FX_BOOL DoScroll(FX_DWORD dwCode, FX_FLOAT fPos = 0.0f);
+
+ protected:
+  IFWL_ScrollBar();
 };
 #endif