Change IFWL_Widget to store a single delegate.

xfa/fwl/core/ifwl_datetimeedit.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/core/ifwl_datetimeedit.h"
 
 #include "third_party/base/ptr_util.h"
 #include "xfa/fwl/core/cfwl_widgetmgr.h"
@@ skipping 13 matching lines @@
 void CFWL_DateTimeEditImpDelegate::OnProcessMessage(CFWL_Message* pMessage) {
   if (m_pOwner->m_pWidgetMgr->IsFormDisabled()) {
     DisForm_OnProcessMessage(pMessage);
     return;
   }
 
   CFWL_MessageType dwHashCode = pMessage->GetClassID();
   if (dwHashCode == CFWL_MessageType::SetFocus ||
       dwHashCode == CFWL_MessageType::KillFocus) {
     IFWL_Widget* pOuter = m_pOwner->GetOuter();
-    pOuter->GetCurrentDelegate()->OnProcessMessage(pMessage);
+    pOuter->GetDelegate()->OnProcessMessage(pMessage);
   }
 }
 
 void CFWL_DateTimeEditImpDelegate::DisForm_OnProcessMessage(
     CFWL_Message* pMessage) {
   CFWL_MessageType dwHashCode = pMessage->GetClassID();
   if (m_pOwner->m_pWidgetMgr->IsFormDisabled()) {
     if (dwHashCode == CFWL_MessageType::Mouse) {
       CFWL_MsgMouse* pMouse = static_cast<CFWL_MsgMouse*>(pMessage);
       if (pMouse->m_dwCmd == FWL_MouseCommand::LeftButtonDown ||
           pMouse->m_dwCmd == FWL_MouseCommand::RightButtonDown) {
         if ((m_pOwner->m_pProperties->m_dwStates & FWL_WGTSTATE_Focused) == 0) {
           m_pOwner->m_pProperties->m_dwStates |= FWL_WGTSTATE_Focused;
         }
         IFWL_DateTimePicker* pDateTime =
             static_cast<IFWL_DateTimePicker*>(m_pOwner->m_pOuter);
         if (pDateTime->IsMonthCalendarShowed()) {
           CFX_RectF rtInvalidate;
           pDateTime->GetWidgetRect(rtInvalidate);
           pDateTime->ShowMonthCalendar(FALSE);
           rtInvalidate.Offset(-rtInvalidate.left, -rtInvalidate.top);
           pDateTime->Repaint(&rtInvalidate);
         }
       }
     }
   }
   CFWL_EditImpDelegate::OnProcessMessage(pMessage);
 }