Unify CFWL_WidgetProperties and CFWL_WidgetImpProperties.

xfa/fwl/core/cfwl_picturebox.cpp

Index: xfa/fwl/core/cfwl_picturebox.cpp
diff --git a/xfa/fwl/core/cfwl_picturebox.cpp b/xfa/fwl/core/cfwl_picturebox.cpp
index dcd716ca021cf32f21c23edcf27ce85c8f2cc7d3..a0e1c30c6c69c5bb19877450b276d40293c5fa0d 100644
--- a/xfa/fwl/core/cfwl_picturebox.cpp
+++ b/xfa/fwl/core/cfwl_picturebox.cpp
@@ -18,7 +18,7 @@ void CFWL_PictureBox::Initialize() {
   ASSERT(!m_pIface);
 
   m_pIface = pdfium::MakeUnique<IFWL_PictureBox>(
-      m_pApp, m_pProperties->MakeWidgetImpProperties(&m_PictureBoxDP));
+      m_pApp, pdfium::MakeUnique<CFWL_WidgetProperties>(&m_PictureBoxDP));
 
   CFWL_Widget::Initialize();
 }