Cleanup unused methods and return values in FWL code.

xfa/fwl/core/ifwl_combolist.cpp

 // Copyright 2016 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_combolist.h"
 
 #include "xfa/fwl/core/ifwl_combobox.h"
 #include "xfa/fwl/core/ifwl_comboedit.h"
 
 IFWL_ComboList::IFWL_ComboList(const CFWL_WidgetImpProperties& properties,
                                IFWL_Widget* pOuter)
     : IFWL_ListBox(properties, pOuter), m_bNotifyOwner(TRUE) {
   ASSERT(pOuter);
 }
 
 FWL_Error IFWL_ComboList::Initialize() {
   if (IFWL_ListBox::Initialize() != FWL_Error::Succeeded)
     return FWL_Error::Indefinite;
   delete m_pDelegate;
   m_pDelegate = new CFWL_ComboListImpDelegate(this);
   return FWL_Error::Succeeded;
 }
 
-FWL_Error IFWL_ComboList::Finalize() {
+void IFWL_ComboList::Finalize() {
   delete m_pDelegate;
   m_pDelegate = nullptr;
-  return IFWL_ListBox::Finalize();
+  IFWL_ListBox::Finalize();
 }
 
 int32_t IFWL_ComboList::MatchItem(const CFX_WideString& wsMatch) {
   if (wsMatch.IsEmpty()) {
     return -1;
   }
   if (!m_pProperties->m_pDataProvider)
     return -1;
   IFWL_ListBoxDP* pData =
       static_cast<IFWL_ListBoxDP*>(m_pProperties->m_pDataProvider);
@@ skipping 242 matching lines @@
       CFX_RectF rtInvalidate;
       rtInvalidate.Set(0, 0, m_pOwner->m_pProperties->m_rtWidget.width,
                        m_pOwner->m_pProperties->m_rtWidget.height);
       m_pOwner->Repaint(&rtInvalidate);
       break;
     }
     default:
       break;
   }
 }