Rename IFWL classes which do not have CFWL equivalents

xfa/fwl/core/cfwl_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_
+#ifndef XFA_FWL_CORE_CFWL_COMBOLIST_H_
+#define XFA_FWL_CORE_CFWL_COMBOLIST_H_
 
 #include <memory>
 
 #include "xfa/fwl/core/cfwl_widgetproperties.h"
 #include "xfa/fwl/core/ifwl_listbox.h"
 #include "xfa/fwl/core/ifwl_widget.h"
 
-class IFWL_ComboList : public IFWL_ListBox {
+class CFWL_ComboList : public IFWL_ListBox {
  public:
-  IFWL_ComboList(const CFWL_App* app,
+  CFWL_ComboList(const CFWL_App* app,
                  std::unique_ptr<CFWL_WidgetProperties> properties,
                  IFWL_Widget* pOuter);
 
   // IFWL_ListBox.
   void OnProcessMessage(CFWL_Message* pMessage) override;
 
   int32_t MatchItem(const CFX_WideString& wsMatch);
 
   void ChangeSelected(int32_t iSel);
 
   void SetNotifyOwner(bool notify) { m_bNotifyOwner = notify; }
 
  private:
   void ClientToOuter(FX_FLOAT& fx, FX_FLOAT& fy);
   void OnDropListFocusChanged(CFWL_Message* pMsg, bool bSet);
   void OnDropListMouseMove(CFWL_MsgMouse* pMsg);
   void OnDropListLButtonDown(CFWL_MsgMouse* pMsg);
   void OnDropListLButtonUp(CFWL_MsgMouse* pMsg);
   bool OnDropListKey(CFWL_MsgKey* pKey);
   void OnDropListKeyDown(CFWL_MsgKey* pKey);
 
   bool m_bNotifyOwner;
 };
 
-#endif  // XFA_FWL_CORE_IFWL_COMBOLIST_H_
+#endif  // XFA_FWL_CORE_CFWL_COMBOLIST_H_