Use smart pointers for class owned pointers

fpdfsdk/formfiller/cffl_listbox.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 FPDFSDK_FORMFILLER_CFFL_LISTBOX_H_
 #define FPDFSDK_FORMFILLER_CFFL_LISTBOX_H_
 
+#include <memory>
 #include <set>
 
 #include "fpdfsdk/formfiller/cffl_formfiller.h"
 
 class CBA_FontMap;
 
 class CFFL_ListBox : public CFFL_FormFiller {
  public:
   CFFL_ListBox(CPDFDoc_Environment* pApp, CPDFSDK_Annot* pWidget);
   ~CFFL_ListBox() override;
@@ skipping 10 matching lines @@
                      PDFSDK_FieldAction& fa) override;
   void SetActionData(CPDFSDK_PageView* pPageView,
                      CPDF_AAction::AActionType type,
                      const PDFSDK_FieldAction& fa) override;
   void SaveState(CPDFSDK_PageView* pPageView) override;
   void RestoreState(CPDFSDK_PageView* pPageView) override;
   CPWL_Wnd* ResetPDFWindow(CPDFSDK_PageView* pPageView,
                            FX_BOOL bRestoreValue) override;
 
  private:
-  CBA_FontMap* m_pFontMap;
+  std::unique_ptr<CBA_FontMap> m_pFontMap;
   std::set<int> m_OriginSelections;
   CFX_ArrayTemplate<int> m_State;
 };
 
 #endif  // FPDFSDK_FORMFILLER_CFFL_LISTBOX_H_