Use smart pointers for class owned pointers in xfa/fxbarcode

xfa/fxbarcode/qrcode/BC_QRCoderBlockPair.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 XFA_FXBARCODE_QRCODE_BC_QRCODERBLOCKPAIR_H_
 #define XFA_FXBARCODE_QRCODE_BC_QRCODERBLOCKPAIR_H_
 
+#include <memory>
+
 class CBC_CommonByteArray;
+
 class CBC_QRCoderBlockPair {
- private:
-  CBC_CommonByteArray* m_dataBytes;
-  CBC_CommonByteArray* m_errorCorrectionBytes;
-
  public:
-  CBC_QRCoderBlockPair(CBC_CommonByteArray* data,
-                       CBC_CommonByteArray* errorCorrection);
+  CBC_QRCoderBlockPair(std::unique_ptr<CBC_CommonByteArray> data,
+                       std::unique_ptr<CBC_CommonByteArray> errorCorrection);
   virtual ~CBC_QRCoderBlockPair();
 
-  CBC_CommonByteArray* GetDataBytes();
-  CBC_CommonByteArray* GetErrorCorrectionBytes();
+  const CBC_CommonByteArray* GetDataBytes() const;
+  const CBC_CommonByteArray* GetErrorCorrectionBytes() const;
+
+ private:
+  std::unique_ptr<CBC_CommonByteArray> m_dataBytes;
+  std::unique_ptr<CBC_CommonByteArray> m_errorCorrectionBytes;
 };
 
 #endif  // XFA_FXBARCODE_QRCODE_BC_QRCODERBLOCKPAIR_H_