Fix CFWL_WidgetImpDelegate hierarchy.

xfa/src/fwl/src/basewidget/fwl_formproxyimp.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"
 #include "../core/include/fwl_targetimp.h"
 #include "../core/include/fwl_noteimp.h"
 #include "../core/include/fwl_widgetimp.h"
@@ skipping 15 matching lines @@
 }
 FX_BOOL CFWL_FormProxyImp::IsInstance(const CFX_WideStringC& wsClass) const {
   if (wsClass == CFX_WideStringC(FWL_CLASS_FormProxy)) {
     return TRUE;
   }
   return CFWL_FormImp::IsInstance(wsClass);
 }
 FWL_ERR CFWL_FormProxyImp::Initialize() {
   _FWL_ERR_CHECK_RETURN_VALUE_IF_FAIL(CFWL_WidgetImp::Initialize(),
                                       FWL_ERR_Indefinite);
-  m_pDelegate = (IFWL_WidgetDelegate*)new CFWL_FormProxyImpDelegate(this);
+  m_pDelegate = new CFWL_FormProxyImpDelegate(this);
   return FWL_ERR_Succeeded;
 }
 FWL_ERR CFWL_FormProxyImp::Finalize() {
-  if (m_pDelegate) {
-    delete (CFWL_FormProxyImpDelegate*)m_pDelegate;
-    m_pDelegate = NULL;
-  }
+  delete m_pDelegate;
+  m_pDelegate = nullptr;
   return CFWL_WidgetImp::Finalize();
 }
 FWL_ERR CFWL_FormProxyImp::Update() {
   return FWL_ERR_Succeeded;
 }
 FWL_ERR CFWL_FormProxyImp::DrawWidget(CFX_Graphics* pGraphics,
                                       const CFX_Matrix* pMatrix) {
   return FWL_ERR_Succeeded;
 }
 CFWL_FormProxyImpDelegate::CFWL_FormProxyImpDelegate(CFWL_FormProxyImp* pOwner)
     : m_pOwner(pOwner) {}
 int32_t CFWL_FormProxyImpDelegate::OnProcessMessage(CFWL_Message* pMessage) {
   IFWL_WidgetDelegate* pDelegate = m_pOwner->m_pOuter->SetDelegate(NULL);
   return pDelegate->OnProcessMessage(pMessage);
 }