Fold IFWL*::{Initialize|Finalize} into constructor/destructor

xfa/fwl/core/cfwl_listbox.cpp

Index: xfa/fwl/core/cfwl_listbox.cpp
diff --git a/xfa/fwl/core/cfwl_listbox.cpp b/xfa/fwl/core/cfwl_listbox.cpp
index 139c488830e651016ad0145d838dd09a0074d97b..800dd2e570d01cbf0d57d727602a6ff3c1b07b13 100644
--- a/xfa/fwl/core/cfwl_listbox.cpp
+++ b/xfa/fwl/core/cfwl_listbox.cpp
@@ -8,6 +8,7 @@
 
 #include <memory>
 
+#include "third_party/base/ptr_util.h"
 #include "third_party/base/stl_util.h"
 
 namespace {
@@ -25,11 +26,9 @@ CFWL_ListBox::~CFWL_ListBox() {}
 void CFWL_ListBox::Initialize() {
   ASSERT(!m_pIface);
 
-  std::unique_ptr<IFWL_ListBox> pListBox(new IFWL_ListBox(
-      m_pApp, m_pProperties->MakeWidgetImpProperties(&m_ListBoxDP), nullptr));
-  pListBox->Initialize();
+  m_pIface = pdfium::MakeUnique<IFWL_ListBox>(
+      m_pApp, m_pProperties->MakeWidgetImpProperties(&m_ListBoxDP), nullptr);
 
-  m_pIface = std::move(pListBox);
   CFWL_Widget::Initialize();
 }