Remove DataProvider from CFWL_WidgetProperties

xfa/fwl/core/cfwl_combobox.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_CFWL_COMBOBOX_H_
 #define XFA_FWL_CORE_CFWL_COMBOBOX_H_
 
 #include <memory>
 #include <vector>
 
 #include "xfa/fwl/core/cfwl_widget.h"
 #include "xfa/fwl/core/ifwl_combobox.h"
 
-class CFWL_ComboBox : public CFWL_Widget, public IFWL_Widget::DataProvider {
+class CFWL_ComboBox : public CFWL_Widget {
  public:
   explicit CFWL_ComboBox(const CFWL_App* pApp);
   ~CFWL_ComboBox() override;
 
   void Initialize();
 
   void AddString(const CFX_WideStringC& wsText);
   bool RemoveAt(int32_t iIndex);  // Returns false iff |iIndex| out of range.
   void RemoveAll();
 
@@ skipping 20 matching lines @@
   bool EditPaste(const CFX_WideString& wsPaste);
   void EditSelectAll();
   void EditDelete();
   void EditDeSelect();
 
   void GetBBox(CFX_RectF& rect);
   void EditModifyStylesEx(uint32_t dwStylesExAdded, uint32_t dwStylesExRemoved);
 };
 
 #endif  // XFA_FWL_CORE_CFWL_COMBOBOX_H_