Use smart pointers for class owned pointers under xfa/fde

xfa/fde/cfde_txtedtengine.h

Index: xfa/fde/cfde_txtedtengine.h
diff --git a/xfa/fde/cfde_txtedtengine.h b/xfa/fde/cfde_txtedtengine.h
index 4bafce68647c7c28123d7c2ee8c8d944ee61aefd..974913936fc364a70652ea16b16433ce3a528ac4 100644
--- a/xfa/fde/cfde_txtedtengine.h
+++ b/xfa/fde/cfde_txtedtengine.h
@@ -7,6 +7,8 @@
 #ifndef XFA_FDE_CFDE_TXTEDTENGINE_H_
 #define XFA_FDE_CFDE_TXTEDTENGINE_H_
 
+#include <memory>
+
 #include "xfa/fde/ifde_txtedtengine.h"
 
 class CFDE_TxtEdtBuf;
@@ -150,8 +152,8 @@ class CFDE_TxtEdtEngine {
   FX_BOOL IsSelect();
   void DeleteSelect();
 
-  CFDE_TxtEdtBuf* m_pTxtBuf;
-  CFX_TxtBreak* m_pTextBreak;
+  std::unique_ptr<CFDE_TxtEdtBuf> m_pTxtBuf;
+  std::unique_ptr<CFX_TxtBreak> m_pTextBreak;
   FDE_TXTEDTPARAMS m_Param;
   CFX_ArrayTemplate<IFDE_TxtEdtPage*> m_PagePtrArray;
   CFX_ArrayTemplate<CFDE_TxtEdtParag*> m_ParagPtrArray;