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

xfa/fwl/core/ifwl_spinbutton.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_spinbutton.h"
 
+#include "third_party/base/ptr_util.h"
 #include "xfa/fwl/core/cfwl_message.h"
 #include "xfa/fwl/core/cfwl_themebackground.h"
 #include "xfa/fwl/core/cfwl_widgetimpproperties.h"
 #include "xfa/fwl/core/fwl_noteimp.h"
 #include "xfa/fwl/core/ifwl_spinbutton.h"
 #include "xfa/fwl/core/ifwl_themeprovider.h"
 #include "xfa/fwl/core/ifwl_themeprovider.h"
 #include "xfa/fwl/core/ifwl_timer.h"
 
 namespace {
@@ skipping 10 matching lines @@
       m_dwUpState(CFWL_PartState_Normal),
       m_dwDnState(CFWL_PartState_Normal),
       m_iButtonIndex(0),
       m_bLButtonDwn(FALSE),
       m_pTimerInfo(nullptr),
       m_Timer(this) {
   m_rtClient.Reset();
   m_rtUpButton.Reset();
   m_rtDnButton.Reset();
   m_pProperties->m_dwStyleExes |= FWL_STYLEEXE_SPB_Vert;
+
+  SetDelegate(pdfium::MakeUnique<CFWL_SpinButtonImpDelegate>(this));
 }
 
 IFWL_SpinButton::~IFWL_SpinButton() {}
 
-void IFWL_SpinButton::Initialize() {
-  IFWL_Widget::Initialize();
-  m_pDelegate = new CFWL_SpinButtonImpDelegate(this);
-}
-
-void IFWL_SpinButton::Finalize() {
-  delete m_pDelegate;
-  m_pDelegate = nullptr;
-  IFWL_Widget::Finalize();
-}
-
 FWL_Type IFWL_SpinButton::GetClassID() const {
   return FWL_Type::SpinButton;
 }
 
 FWL_Error IFWL_SpinButton::GetWidgetRect(CFX_RectF& rect, FX_BOOL bAutoSize) {
   if (bAutoSize) {
     rect.Set(0, 0, kMinWidth, kMinHeight);
     IFWL_Widget::GetWidgetRect(rect, TRUE);
   } else {
     rect = m_pProperties->m_rtWidget;
@@ skipping 354 matching lines @@
   IFWL_SpinButton* pButton = static_cast<IFWL_SpinButton*>(m_pWidget);
 
   if (!pButton->m_pTimerInfo)
     return;
 
   CFWL_EvtSpbClick wmPosChanged;
   wmPosChanged.m_pSrcTarget = pButton;
   wmPosChanged.m_bUp = pButton->m_iButtonIndex == 0;
   pButton->DispatchEvent(&wmPosChanged);
 }