Return unique_ptrs from CFX_DIBitmap::Clone().

xfa/fxbarcode/oned/BC_OneDimWriter.cpp

 // 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
 // Original code is licensed as follows:
 /*
  * Copyright 2011 ZXing authors
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ skipping 325 matching lines @@
   int32_t i = 0;
   for (; i < contents.GetLength(); i++)
     if (contents.GetAt(i) != ' ') {
       break;
     }
   if (m_locTextLoc != BC_TEXT_LOC_NONE && i < contents.GetLength()) {
     ShowChars(contents, pOutBitmap, nullptr, nullptr, m_barWidth, m_multiple,
               e);
     BC_EXCEPTION_CHECK_ReturnVoid(e);
   }
-  CFX_DIBitmap* pStretchBitmap = pOutBitmap->StretchTo(m_Width, m_Height);
+  std::unique_ptr<CFX_DIBitmap> pStretchBitmap =
+      pOutBitmap->StretchTo(m_Width, m_Height);
   delete pOutBitmap;
-  pOutBitmap = pStretchBitmap;
+  pOutBitmap = pStretchBitmap.release();
 }
 
 void CBC_OneDimWriter::RenderDeviceResult(CFX_RenderDevice* device,
                                           const CFX_Matrix* matrix,
                                           const CFX_WideStringC& contents,
                                           int32_t& e) {
   if (!m_output)
     BC_EXCEPTION_CHECK_ReturnVoid(e);
 
   CFX_GraphStateData stateData;
@@ skipping 107 matching lines @@
 
 CFX_WideString CBC_OneDimWriter::FilterContents(
     const CFX_WideStringC& contents) {
   return CFX_WideString();
 }
 
 CFX_WideString CBC_OneDimWriter::RenderTextContents(
     const CFX_WideStringC& contents) {
   return CFX_WideString();
 }