Fix all the code which has duplicate variable declarations

xfa/fwl/basewidget/fwl_datetimepickerimp.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/basewidget/fwl_datetimepickerimp.h"
 
 #include "xfa/fwl/basewidget/fwl_editimp.h"
 #include "xfa/fwl/basewidget/fwl_formproxyimp.h"
@@ skipping 308 matching lines @@
       lpDatesInfo = m_pOwner->m_arrDates.GetAt(iOldSel - 1);
       rtInvalidate.Union(lpDatesInfo->rect);
     }
     m_pOwner->AddSelDay(iCurSel);
     if (!m_pOwner->m_pOuter)
       return;
     pPicker->ProcessSelChanged(m_pOwner->m_iCurYear, m_pOwner->m_iCurMonth,
                                iCurSel);
     pPicker->ShowMonthCalendar(FALSE);
   } else if (m_bFlag && (!rt.Contains(pMsg->m_fx, pMsg->m_fy))) {
-    IFWL_DateTimePicker* pIPicker =
-        static_cast<IFWL_DateTimePicker*>(m_pOwner->m_pOuter);
-    CFWL_DateTimePickerImp* pPicker =
-        static_cast<CFWL_DateTimePickerImp*>(pIPicker->GetImpl());
     pPicker->ShowMonthCalendar(FALSE);
   }
   m_bFlag = 0;
 }
 void CFWL_DateTimeCalendarImpDelegate::OnMouseMoveEx(CFWL_MsgMouse* pMsg) {
   if (m_pOwner->m_pProperties->m_dwStyleExes & FWL_STYLEEXT_MCD_MultiSelect) {
     return;
   }
   FX_BOOL bRepaint = FALSE;
   CFX_RectF rtInvalidate;
@@ skipping 838 matching lines @@
     }
     if (m_pOwner->m_pEdit->GetStates() & FWL_WGTSTATE_Focused) {
       pMsg->m_pSrcTarget = m_pOwner->m_pEdit.get();
       IFWL_WidgetDelegate* pDelegate = m_pOwner->m_pEdit->SetDelegate(NULL);
       pDelegate->OnProcessMessage(pMsg);
     }
   }
   rtInvalidate.Inflate(2, 2);
   m_pOwner->Repaint(&rtInvalidate);
 }