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

xfa/fwl/core/ifwl_formproxy.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_formproxy.h"
 
+#include "third_party/base/ptr_util.h"
 #include "xfa/fwl/core/fwl_noteimp.h"
 
 IFWL_FormProxy::IFWL_FormProxy(const IFWL_App* app,
                                const CFWL_WidgetImpProperties& properties,
                                IFWL_Widget* pOuter)
-    : IFWL_Form(app, properties, pOuter) {}
+    : IFWL_Form(app, properties, pOuter) {
+  SetDelegate(pdfium::MakeUnique<CFWL_FormProxyImpDelegate>(this));
+}
 
 IFWL_FormProxy::~IFWL_FormProxy() {}
 
-void IFWL_FormProxy::Initialize() {
-  IFWL_Widget::Initialize();
-  m_pDelegate = new CFWL_FormProxyImpDelegate(this);
-}
-
-void IFWL_FormProxy::Finalize() {
-  delete m_pDelegate;
-  m_pDelegate = nullptr;
-  IFWL_Widget::Finalize();
-}
-
 FWL_Type IFWL_FormProxy::GetClassID() const {
   return FWL_Type::FormProxy;
 }
 
 FX_BOOL IFWL_FormProxy::IsInstance(const CFX_WideStringC& wsClass) const {
   if (wsClass == CFX_WideStringC(FWL_CLASS_FormProxy)) {
     return TRUE;
   }
   return IFWL_Form::IsInstance(wsClass);
 }
 
 FWL_Error IFWL_FormProxy::Update() {
   return FWL_Error::Succeeded;
 }
 
 FWL_Error IFWL_FormProxy::DrawWidget(CFX_Graphics* pGraphics,
                                      const CFX_Matrix* pMatrix) {
   return FWL_Error::Succeeded;
 }
 
 CFWL_FormProxyImpDelegate::CFWL_FormProxyImpDelegate(IFWL_FormProxy* pOwner)
     : m_pOwner(pOwner) {}
 
 void CFWL_FormProxyImpDelegate::OnProcessMessage(CFWL_Message* pMessage) {
   m_pOwner->m_pOuter->GetCurrentDelegate()->OnProcessMessage(pMessage);
 }