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

xfa/fwl/core/ifwl_datetimeedit.cpp

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "xfa/fwl/core/ifwl_datetimeedit.h"
 
+#include "third_party/base/ptr_util.h"
 #include "xfa/fwl/core/cfwl_widgetmgr.h"
 #include "xfa/fwl/core/ifwl_datetimepicker.h"
 
 IFWL_DateTimeEdit::IFWL_DateTimeEdit(const IFWL_App* app,
                                      const CFWL_WidgetImpProperties& properties,
                                      IFWL_Widget* pOuter)
-    : IFWL_Edit(app, properties, pOuter) {}
-
-void IFWL_DateTimeEdit::Initialize() {
-  IFWL_Edit::Initialize();
-
-  // Delete delegate set by IFWL_Edit::Initialize.
-  delete m_pDelegate;
-  m_pDelegate = new CFWL_DateTimeEditImpDelegate(this);
-}
-
-void IFWL_DateTimeEdit::Finalize() {
-  delete m_pDelegate;
-  m_pDelegate = nullptr;
-  IFWL_Edit::Finalize();
+    : IFWL_Edit(app, properties, pOuter) {
+  SetDelegate(pdfium::MakeUnique<CFWL_DateTimeEditImpDelegate>(this));
 }
 
 CFWL_DateTimeEditImpDelegate::CFWL_DateTimeEditImpDelegate(
     IFWL_DateTimeEdit* pOwner)
     : CFWL_EditImpDelegate(pOwner), m_pOwner(pOwner) {}
 
 void CFWL_DateTimeEditImpDelegate::OnProcessMessage(CFWL_Message* pMessage) {
   if (m_pOwner->m_pWidgetMgr->IsFormDisabled()) {
     DisForm_OnProcessMessage(pMessage);
     return;
@@ skipping 25 matching lines @@
           pDateTime->GetWidgetRect(rtInvalidate);
           pDateTime->ShowMonthCalendar(FALSE);
           rtInvalidate.Offset(-rtInvalidate.left, -rtInvalidate.top);
           pDateTime->Repaint(&rtInvalidate);
         }
       }
     }
   }
   CFWL_EditImpDelegate::OnProcessMessage(pMessage);
 }