Remove IFWL_*::Create methods, use new

xfa/fwl/lightwidget/cfwl_combobox.cpp

Index: xfa/fwl/lightwidget/cfwl_combobox.cpp
diff --git a/xfa/fwl/lightwidget/cfwl_combobox.cpp b/xfa/fwl/lightwidget/cfwl_combobox.cpp
index 9c4cd05e57bd1bb5a0fce0367b0cb252581288be..6a55b3b479f9facbbbfb90f9ebce1f8a36634f5c 100644
--- a/xfa/fwl/lightwidget/cfwl_combobox.cpp
+++ b/xfa/fwl/lightwidget/cfwl_combobox.cpp
@@ -8,6 +8,7 @@
 
 #include <utility>
 
+#include "third_party/base/ptr_util.h"
 #include "xfa/fwl/core/fwl_error.h"
 #include "xfa/fwl/core/ifwl_widget.h"
 
@@ -25,8 +26,8 @@ FWL_Error CFWL_ComboBox::Initialize(const CFWL_WidgetProperties* pProperties) {
   if (pProperties) {
     *m_pProperties = *pProperties;
   }
-  std::unique_ptr<IFWL_ComboBox> pComboBox(IFWL_ComboBox::Create(
-      m_pProperties->MakeWidgetImpProperties(&m_comboBoxData)));
+  std::unique_ptr<IFWL_ComboBox> pComboBox = pdfium::MakeUnique<IFWL_ComboBox>(
+      m_pProperties->MakeWidgetImpProperties(&m_comboBoxData));
   FWL_Error ret = pComboBox->Initialize();
   if (ret != FWL_Error::Succeeded) {
     return ret;