Remove Release() from IFX_CharIter, use unique_ptrs.

xfa/fee/fde_txtedtpage.h

Index: xfa/fee/fde_txtedtpage.h
diff --git a/xfa/fee/fde_txtedtpage.h b/xfa/fee/fde_txtedtpage.h
index 8ac104c2a761b3ea80e36a1fcdd4da3bd780fad8..81f29fed496f859bd9aae6cb2b5381dbcabf1246 100644
--- a/xfa/fee/fde_txtedtpage.h
+++ b/xfa/fee/fde_txtedtpage.h
@@ -7,6 +7,8 @@
 #ifndef XFA_FEE_FDE_TXTEDTPAGE_H_
 #define XFA_FEE_FDE_TXTEDTPAGE_H_
 
+#include <memory>
+
 #include "core/fxcrt/include/fx_coordinates.h"
 #include "core/fxcrt/include/fx_string.h"
 #include "xfa/fde/fde_visualset.h"
@@ -147,7 +149,7 @@ class CFDE_TxtEdtPage : public IFDE_TxtEdtPage {
                         const CFX_RectF& rtF,
                         FX_FLOAT fTolerance) const;
 
-  IFX_CharIter* m_pIter;
+  std::unique_ptr<IFX_CharIter> m_pIter;
   CFDE_TxtEdtTextSet* m_pTextSet;
   CFDE_TxtEdtEngine* m_pEditEngine;
   CFDE_TXTEDTPieceMassArray m_PieceMassArr;