Fix a leak with FPDFPageObj_NewImgeObj().

core/fpdfapi/fpdf_edit/cpdf_pagecontentgenerator.cpp

 // 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
 
 #include "core/fpdfapi/fpdf_edit/include/cpdf_pagecontentgenerator.h"
 
 #include "core/fpdfapi/fpdf_edit/include/cpdf_creator.h"
 #include "core/fpdfapi/fpdf_page/include/cpdf_image.h"
@@ skipping 81 matching lines @@
       (pImageObj->m_Matrix.c == 0 && pImageObj->m_Matrix.d == 0)) {
     return;
   }
   buf << "q " << pImageObj->m_Matrix << " cm ";
   CPDF_Image* pImage = pImageObj->GetImage();
   if (!pImage->IsInline()) {
     CPDF_Stream* pStream = pImage->GetStream();
     uint32_t dwSavedObjNum = pStream->GetObjNum();
     CFX_ByteString name = RealizeResource(pStream, "XObject");
     if (dwSavedObjNum == 0) {
-      pImage->Release();
-      pImageObj->m_pImage = m_pDocument->GetPageData()->GetImage(pStream);
+      pImageObj->SetUnownedImage(m_pDocument->GetPageData()->GetImage(pStream));
     }
     buf << "/" << PDF_NameEncode(name) << " Do Q\n";
   }
 }
+
 void CPDF_PageContentGenerator::ProcessForm(CFX_ByteTextBuf& buf,
                                             const uint8_t* data,
                                             uint32_t size,
                                             CFX_Matrix& matrix) {
   if (!data || !size) {
     return;
   }
   CPDF_Stream* pStream = new CPDF_Stream(nullptr, 0, nullptr);
   CPDF_Dictionary* pFormDict = new CPDF_Dictionary;
   pFormDict->SetAtName("Type", "XObject");
@@ skipping 45 matching lines @@
     CPDF_StreamAcc contentStream;
     contentStream.LoadAllData(pStream);
     ProcessForm(buf, contentStream.GetData(), contentStream.GetSize(), matrix);
   }
   CPDF_Stream* pStream = new CPDF_Stream(nullptr, 0, nullptr);
   pStream->SetData(buf.GetBuffer(), buf.GetLength(), FALSE, FALSE);
   m_pDocument->AddIndirectObject(pStream);
   m_pPage->m_pFormDict->SetAtReference("Contents", m_pDocument,
                                        pStream->GetObjNum());
 }