Change layout item in CFWL_Widget type from void

xfa/fwl/cfwl_edit.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/cfwl_edit.h"
 
 #include <algorithm>
 #include <memory>
@@ skipping 1150 matching lines @@
 
   CFWL_Widget* pOuter = this;
   pRect->Offset(m_pProperties->m_rtWidget.left, m_pProperties->m_rtWidget.top);
   while (pOuter->GetOuter()) {
     pOuter = pOuter->GetOuter();
 
     CFX_RectF rtOuter = pOuter->GetWidgetRect();
     pRect->Offset(rtOuter.left, rtOuter.top);
   }
 
-  CXFA_FFWidget* pXFAWidget =
-      static_cast<CXFA_FFWidget*>(pOuter->GetLayoutItem());
+  CXFA_FFWidget* pXFAWidget = pOuter->GetLayoutItem();
   if (!pXFAWidget)
     return;
 
   IXFA_DocEnvironment* pDocEnvironment =
       pXFAWidget->GetDoc()->GetDocEnvironment();
   if (!pDocEnvironment)
     return;
 
   CFX_Matrix mt;
   pXFAWidget->GetRotateMatrix(mt);
 
   CFX_RectF rt(*pRect);
   mt.TransformRect(rt);
   pDocEnvironment->DisplayCaret(pXFAWidget, true, &rt);
 }
 
 void CFWL_Edit::HideCaret(CFX_RectF* pRect) {
   if (m_pCaret) {
     m_pCaret->HideCaret();
     RepaintRect(m_rtEngine);
     return;
   }
 
   CFWL_Widget* pOuter = this;
   while (pOuter->GetOuter())
     pOuter = pOuter->GetOuter();
 
-  CXFA_FFWidget* pXFAWidget =
-      static_cast<CXFA_FFWidget*>(pOuter->GetLayoutItem());
+  CXFA_FFWidget* pXFAWidget = pOuter->GetLayoutItem();
   if (!pXFAWidget)
     return;
 
   IXFA_DocEnvironment* pDocEnvironment =
       pXFAWidget->GetDoc()->GetDocEnvironment();
   if (!pDocEnvironment)
     return;
 
   pDocEnvironment->DisplayCaret(pXFAWidget, false, pRect);
 }
@@ skipping 416 matching lines @@
   pScrollBar->SetTrackPos(fPos);
   UpdateOffset(pScrollBar, fPos - iCurPos);
   UpdateCaret();
 
   CFX_RectF rect = GetWidgetRect();
   CFX_RectF rtInvalidate;
   rtInvalidate.Set(0, 0, rect.width + 2, rect.height + 2);
   RepaintRect(rtInvalidate);
   return true;
 }