Cleanup unused methods and return values in FWL code.

xfa/fwl/core/ifwl_combolist.h

 // 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
 
 #ifndef XFA_FWL_CORE_IFWL_COMBOLIST_H_
 #define XFA_FWL_CORE_IFWL_COMBOLIST_H_
 
 #include "xfa/fwl/core/cfwl_widgetimpproperties.h"
 #include "xfa/fwl/core/ifwl_listbox.h"
 #include "xfa/fwl/core/ifwl_widget.h"
 
 class IFWL_ComboList : public IFWL_ListBox {
  public:
   IFWL_ComboList(const CFWL_WidgetImpProperties& properties,
                  IFWL_Widget* pOuter);
 
   // IFWL_Widget
   FWL_Error Initialize() override;
-  FWL_Error Finalize() override;
+  void Finalize() override;
 
   int32_t MatchItem(const CFX_WideString& wsMatch);
   void ChangeSelected(int32_t iSel);
   int32_t CountItems();
   void GetItemRect(int32_t nIndex, CFX_RectF& rtItem);
   void ClientToOuter(FX_FLOAT& fx, FX_FLOAT& fy);
   void SetFocus(FX_BOOL bSet);
 
   FX_BOOL m_bNotifyOwner;
 
@@ skipping 10 matching lines @@
   void OnDropListFocusChanged(CFWL_Message* pMsg, FX_BOOL bSet = TRUE);
   int32_t OnDropListMouseMove(CFWL_MsgMouse* pMsg);
   int32_t OnDropListLButtonDown(CFWL_MsgMouse* pMsg);
   int32_t OnDropListLButtonUp(CFWL_MsgMouse* pMsg);
   int32_t OnDropListKey(CFWL_MsgKey* pKey);
   void OnDropListKeyDown(CFWL_MsgKey* pKey);
   IFWL_ComboList* m_pOwner;
 };
 
 #endif  // XFA_FWL_CORE_IFWL_COMBOLIST_H_