Use smart pointers for class owned pointers

fpdfsdk/formfiller/cffl_textfield.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_TEXTFIELD_H_
 #define FPDFSDK_FORMFILLER_CFFL_TEXTFIELD_H_
 
+#include <memory>
+
 #include "fpdfsdk/formfiller/cffl_formfiller.h"
 
 #define BF_ALIGN_LEFT 0
 #define BF_ALIGN_MIDDLE 1
 #define BF_ALIGN_RIGHT 2
 
 class CBA_FontMap;
 
 struct FFL_TextFieldState {
+  FFL_TextFieldState() : nStart(0), nEnd(0) {}
+
   int nStart;
   int nEnd;
   CFX_WideString sValue;
 };
 
 class CFFL_TextField : public CFFL_FormFiller, public IPWL_FocusHandler {
  public:
   CFFL_TextField(CPDFDoc_Environment* pApp, CPDFSDK_Annot* pAnnot);
   ~CFFL_TextField() override;
 
@@ skipping 20 matching lines @@
 
   // IPWL_FocusHandler:
   void OnSetFocus(CPWL_Wnd* pWnd) override;
 
 #ifdef PDF_ENABLE_XFA
   // CFFL_FormFiller:
   FX_BOOL IsFieldFull(CPDFSDK_PageView* pPageView) override;
 #endif  // PDF_ENABLE_XFA
 
  private:
-  CBA_FontMap* m_pFontMap;
+  std::unique_ptr<CBA_FontMap> m_pFontMap;
   FFL_TextFieldState m_State;
 };
 
 #endif  // FPDFSDK_FORMFILLER_CFFL_TEXTFIELD_H_