CPDF_VariableText::GetIterator() never returns NULL.

core/fpdfdoc/include/cpdf_variabletext.h

 // Copyright 2016 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 CORE_FPDFDOC_INCLUDE_CPDF_VARIABLETEXT_H_
 #define CORE_FPDFDOC_INCLUDE_CPDF_VARIABLETEXT_H_
 
+#include <memory>
+
 #include "core/fpdfdoc/cpvt_floatrect.h"
 #include "core/fpdfdoc/cpvt_lineinfo.h"
 #include "core/fpdfdoc/include/cpvt_line.h"
 #include "core/fpdfdoc/include/cpvt_wordplace.h"
 #include "core/fpdfdoc/include/cpvt_wordrange.h"
 #include "core/fpdfdoc/pdf_vt.h"
 #include "core/fxcrt/include/fx_coordinates.h"
 #include "core/fxcrt/include/fx_string.h"
 #include "core/fxcrt/include/fx_system.h"
 
@@ skipping 219 matching lines @@
   FX_BOOL m_bAutoFontSize;
   int32_t m_nAlignment;
   FX_FLOAT m_fLineLeading;
   FX_FLOAT m_fCharSpace;
   int32_t m_nHorzScale;
   uint16_t m_wSubWord;
   FX_FLOAT m_fFontSize;
   FX_BOOL m_bInitial;
   FX_BOOL m_bRichText;
   CPDF_VariableText::Provider* m_pVTProvider;
-  CPDF_VariableText::Iterator* m_pVTIterator;
+  std::unique_ptr<CPDF_VariableText::Iterator> m_pVTIterator;
 };
 
 #endif  // CORE_FPDFDOC_INCLUDE_CPDF_VARIABLETEXT_H_