Replace more static casts in FWL (part 3)

xfa/src/fwl/src/lightwidget/caret.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_Caret* CFWL_Caret::Create() {
   return new CFWL_Caret;
 }
 FWL_ERR CFWL_Caret::Initialize(const CFWL_WidgetProperties* pProperties) {
   if (m_pIface)
     return FWL_ERR_Indefinite;
   if (pProperties) {
     *m_pProperties = *pProperties;
   }
   nonstd::unique_ptr<IFWL_Caret> pCaret(IFWL_Caret::Create(
       m_pProperties->MakeWidgetImpProperties(nullptr), nullptr));
   FWL_ERR ret = pCaret->Initialize();
   if (ret != FWL_ERR_Succeeded) {
     return ret;
   }
   m_pIface = pCaret.release();
   CFWL_Widget::Initialize();
   return FWL_ERR_Succeeded;
 }
 FWL_ERR CFWL_Caret::ShowCaret(FX_BOOL bFlag) {
-  return ((IFWL_Caret*)m_pIface)->ShowCaret(bFlag);
+  return static_cast<IFWL_Caret*>(m_pIface)->ShowCaret(bFlag);
 }
 FWL_ERR CFWL_Caret::GetFrequency(FX_DWORD& elapse) {
-  return ((IFWL_Caret*)m_pIface)->GetFrequency(elapse);
+  return static_cast<IFWL_Caret*>(m_pIface)->GetFrequency(elapse);
 }
 FWL_ERR CFWL_Caret::SetFrequency(FX_DWORD elapse) {
-  return ((IFWL_Caret*)m_pIface)->SetFrequency(elapse);
+  return static_cast<IFWL_Caret*>(m_pIface)->SetFrequency(elapse);
 }
 FWL_ERR CFWL_Caret::SetColor(CFX_Color crFill) {
-  return ((IFWL_Caret*)m_pIface)->SetColor(crFill);
+  return static_cast<IFWL_Caret*>(m_pIface)->SetColor(crFill);
 }
 CFWL_Caret::CFWL_Caret() {}
 CFWL_Caret::~CFWL_Caret() {}