Fix CFWL_WidgetImpDelegate hierarchy.

xfa/src/fwl/src/basewidget/fwl_pushbuttonimp.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 33 matching lines @@
 FWL_ERR CFWL_PushButtonImp::GetClassName(CFX_WideString& wsClass) const {
   wsClass = FWL_CLASS_PushButton;
   return FWL_ERR_Succeeded;
 }
 FX_DWORD CFWL_PushButtonImp::GetClassID() const {
   return FWL_CLASSHASH_PushButton;
 }
 FWL_ERR CFWL_PushButtonImp::Initialize() {
   _FWL_ERR_CHECK_RETURN_VALUE_IF_FAIL(CFWL_WidgetImp::Initialize(),
                                       FWL_ERR_Indefinite);
-  m_pDelegate = (IFWL_WidgetDelegate*)new CFWL_PushButtonImpDelegate(this);
+  m_pDelegate = new CFWL_PushButtonImpDelegate(this);
   return FWL_ERR_Succeeded;
 }
 FWL_ERR CFWL_PushButtonImp::Finalize() {
-  if (m_pDelegate) {
-    delete (CFWL_PushButtonImpDelegate*)m_pDelegate;
-    m_pDelegate = NULL;
-  }
+  delete m_pDelegate;
+  m_pDelegate = nullptr;
   return CFWL_WidgetImp::Finalize();
 }
 FWL_ERR CFWL_PushButtonImp::GetWidgetRect(CFX_RectF& rect, FX_BOOL bAutoSize) {
   if (bAutoSize) {
     rect.Set(0, 0, 0, 0);
     if (m_pProperties->m_pThemeProvider == NULL) {
       m_pProperties->m_pThemeProvider = GetAvailableTheme();
     }
     CFX_WideString wsCaption;
     IFWL_PushButtonDP* pData =
@@ skipping 471 matching lines @@
     CFWL_EvtClick wmClick;
     wmClick.m_pSrcTarget = (IFWL_PushButton*)m_pOwner->m_pInterface;
     m_pOwner->DispatchEvent(&wmClick);
     return;
   }
   if (pMsg->m_dwKeyCode != FWL_VKEY_Tab) {
     return;
   }
   m_pOwner->DispatchKeyEvent(pMsg);
 }