Change layout item in CFWL_Widget type from void

xfa/fxfa/app/xfa_fwltheme.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/fxfa/app/xfa_fwltheme.h"
 
 #include "xfa/fde/tto/fde_textout.h"
 #include "xfa/fgas/crt/fgas_codepage.h"
@@ skipping 20 matching lines @@
 const FX_WCHAR* const g_FWLTheme_CalFonts[] = {
     L"Arial", L"Courier New", L"DejaVu Sans",
 };
 
 }  // namespace
 
 CXFA_FFWidget* XFA_ThemeGetOuterWidget(CFWL_Widget* pWidget) {
   CFWL_Widget* pOuter = pWidget;
   while (pOuter && pOuter->GetOuter())
     pOuter = pOuter->GetOuter();
-
-  return pOuter ? static_cast<CXFA_FFWidget*>(pOuter->GetLayoutItem())
-                : nullptr;
+  return pOuter ? pOuter->GetLayoutItem() : nullptr;
 }
 
 CXFA_FWLTheme::CXFA_FWLTheme(CXFA_FFApp* pApp)
     : m_pCheckBoxTP(new CFWL_CheckBoxTP),
       m_pListBoxTP(new CFWL_ListBoxTP),
       m_pPictureBoxTP(new CFWL_PictureBoxTP),
       m_pSrollBarTP(new CFWL_ScrollBarTP),
       m_pEditTP(new CFWL_EditTP),
       m_pComboBoxTP(new CFWL_ComboBoxTP),
       m_pMonthCalendarTP(new CFWL_MonthCalendarTP),
@@ skipping 309 matching lines @@
     case FWL_Type::PushButton:
       return m_pPushButtonTP.get();
     case FWL_Type::Caret:
       return m_pCaretTP.get();
     case FWL_Type::Barcode:
       return m_pBarcodeTP.get();
     default:
       return nullptr;
   }
 }