Unify CFWL_WidgetProperties and CFWL_WidgetImpProperties.

xfa/fwl/core/ifwl_form.cpp

Index: xfa/fwl/core/ifwl_form.cpp
diff --git a/xfa/fwl/core/ifwl_form.cpp b/xfa/fwl/core/ifwl_form.cpp
index ab6887fec8ec7a92a3e6d06dae7be99777dbb3ba..82148a07cf3ef7f9c06d3c4fff8c92158d284cdb 100644
--- a/xfa/fwl/core/ifwl_form.cpp
+++ b/xfa/fwl/core/ifwl_form.cpp
@@ -38,9 +38,9 @@ RestoreInfo::RestoreInfo() {}
 RestoreInfo::~RestoreInfo() {}
 
 IFWL_Form::IFWL_Form(const IFWL_App* app,
-                     const CFWL_WidgetImpProperties& properties,
+                     std::unique_ptr<CFWL_WidgetProperties> properties,
                      IFWL_Widget* pOuter)
-    : IFWL_Widget(app, properties, pOuter),
+    : IFWL_Widget(app, std::move(properties), pOuter),
       m_pCloseBox(nullptr),
       m_pMinBox(nullptr),
       m_pMaxBox(nullptr),