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

xfa/fwl/core/ifwl_scrollbar.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_scrollbar.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_themepart.h"
 #include "xfa/fwl/core/fwl_noteimp.h"
 #include "xfa/fwl/core/ifwl_scrollbar.h"
 #include "xfa/fwl/core/ifwl_themeprovider.h"
 
 #define FWL_SCROLLBAR_Elapse 500
 #define FWL_SCROLLBAR_MinThumb 5
 
@@ skipping 25 matching lines @@
       m_bMinSize(FALSE),
       m_bCustomLayout(false),
       m_fMinThumb(FWL_SCROLLBAR_MinThumb),
       m_Timer(this) {
   m_rtClient.Reset();
   m_rtThumb.Reset();
   m_rtMinBtn.Reset();
   m_rtMaxBtn.Reset();
   m_rtMinTrack.Reset();
   m_rtMaxTrack.Reset();
+
+  SetDelegate(pdfium::MakeUnique<CFWL_ScrollBarImpDelegate>(this));
 }
 
 IFWL_ScrollBar::~IFWL_ScrollBar() {}
 
-void IFWL_ScrollBar::Initialize() {
-  IFWL_Widget::Initialize();
-  m_pDelegate = new CFWL_ScrollBarImpDelegate(this);
-}
-
-void IFWL_ScrollBar::Finalize() {
-  delete m_pDelegate;
-  m_pDelegate = nullptr;
-  IFWL_Widget::Finalize();
-}
-
 FWL_Type IFWL_ScrollBar::GetClassID() const {
   return FWL_Type::ScrollBar;
 }
 
 FWL_Error IFWL_ScrollBar::GetWidgetRect(CFX_RectF& rect, FX_BOOL bAutoSize) {
   if (bAutoSize) {
     rect.Set(0, 0, 0, 0);
     FX_FLOAT* pfMinWidth = static_cast<FX_FLOAT*>(
         GetThemeCapacity(CFWL_WidgetCapacity::ScrollBarWidth));
     if (!pfMinWidth)
@@ skipping 692 matching lines @@
 
 void IFWL_ScrollBar::Timer::Run(IFWL_TimerInfo* pTimerInfo) {
   IFWL_ScrollBar* pButton = static_cast<IFWL_ScrollBar*>(m_pWidget);
 
   if (pButton->m_pTimerInfo)
     pButton->m_pTimerInfo->StopTimer();
 
   if (!pButton->SendEvent())
     pButton->m_pTimerInfo = StartTimer(0, true);
 }