FWL refcounts never incremented (part 2).

xfa/src/fwl/src/lightwidget/pushbutton.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 "../../../foxitlib.h"
 CFWL_PushButton* CFWL_PushButton::Create() {
   return new CFWL_PushButton;
 }
 FWL_ERR CFWL_PushButton::Initialize(const CFWL_WidgetProperties* pProperties) {
   if (m_pIface)
     return FWL_ERR_Indefinite;
   if (pProperties) {
     *m_pProperties = *pProperties;
   }
-  m_pIface = new IFWL_PushButton;
-  FWL_ERR ret =
-      ((IFWL_PushButton*)m_pIface)
-          ->Initialize(m_pProperties->MakeWidgetImpProperties(&m_buttonData),
-                       nullptr);
-  if (ret == FWL_ERR_Succeeded) {
-    CFWL_Widget::Initialize();
+  nonstd::unique_ptr<IFWL_PushButton> pPushButton(IFWL_PushButton::Create(
+      m_pProperties->MakeWidgetImpProperties(&m_buttonData), nullptr));
+  FWL_ERR ret = pPushButton->Initialize();
+  if (ret != FWL_ERR_Succeeded) {
+    return ret;
   }
-  return ret;
+  m_pIface = pPushButton.release();
+  CFWL_Widget::Initialize();
+  return FWL_ERR_Succeeded;
 }
 FWL_ERR CFWL_PushButton::GetCaption(CFX_WideString& wsCaption) {
   wsCaption = m_buttonData.m_wsCaption;
   return FWL_ERR_Succeeded;
 }
 FWL_ERR CFWL_PushButton::SetCaption(const CFX_WideStringC& wsCaption) {
   m_buttonData.m_wsCaption = wsCaption;
   return FWL_ERR_Succeeded;
 }
 CFX_DIBitmap* CFWL_PushButton::GetPicture() {
   return m_buttonData.m_pBitmap;
 }
 FWL_ERR CFWL_PushButton::SetPicture(CFX_DIBitmap* pBitmap) {
   m_buttonData.m_pBitmap = pBitmap;
   return FWL_ERR_Succeeded;
 }
 CFWL_PushButton::CFWL_PushButton() {}
 CFWL_PushButton::~CFWL_PushButton() {}
 FWL_ERR CFWL_PushButton::CFWL_PushButtonDP::GetCaption(
     IFWL_Widget* pWidget,
     CFX_WideString& wsCaption) {
   wsCaption = m_wsCaption;
   return FWL_ERR_Succeeded;
 }
 CFX_DIBitmap* CFWL_PushButton::CFWL_PushButtonDP::GetPicture(
     IFWL_Widget* pWidget) {
   return m_pBitmap;
 }