Unify CFWL_WidgetProperties and CFWL_WidgetImpProperties.

xfa/fwl/core/ifwl_comboboxproxy.cpp

Index: xfa/fwl/core/ifwl_comboboxproxy.cpp
diff --git a/xfa/fwl/core/ifwl_comboboxproxy.cpp b/xfa/fwl/core/ifwl_comboboxproxy.cpp
index 0675a3b9ecadda6aa86f9236cc4342cdf2319029..c8d1f793c65ccc16210fbc08ef94a3e8a58d4395 100644
--- a/xfa/fwl/core/ifwl_comboboxproxy.cpp
+++ b/xfa/fwl/core/ifwl_comboboxproxy.cpp
@@ -13,9 +13,9 @@
 IFWL_ComboBoxProxy::IFWL_ComboBoxProxy(
     IFWL_ComboBox* pComboBox,
     const IFWL_App* app,
-    const CFWL_WidgetImpProperties& properties,
+    std::unique_ptr<CFWL_WidgetProperties> properties,
     IFWL_Widget* pOuter)
-    : IFWL_FormProxy(app, properties, pOuter),
+    : IFWL_FormProxy(app, std::move(properties), pOuter),
       m_bLButtonDown(false),
       m_bLButtonUpSelf(false),
       m_pComboBox(pComboBox) {}