Remove some usage of |return XXX.release()| anti-pattern.

core/fpdfapi/page/cpdf_image.h

 // 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
 
 #ifndef CORE_FPDFAPI_PAGE_CPDF_IMAGE_H_
 #define CORE_FPDFAPI_PAGE_CPDF_IMAGE_H_
 
 #include <memory>
@@ skipping 26 matching lines @@
   CPDF_Dictionary* GetOC() const { return m_pOC; }
   CPDF_Document* GetDocument() const { return m_pDocument; }
 
   int32_t GetPixelHeight() const { return m_Height; }
   int32_t GetPixelWidth() const { return m_Width; }
 
   bool IsInline() const { return m_bIsInline; }
   bool IsMask() const { return m_bIsMask; }
   bool IsInterpol() const { return m_bInterpolate; }
 
-  CFX_DIBSource* LoadDIBSource(CFX_DIBSource** ppMask = nullptr,
-                               uint32_t* pMatteColor = nullptr,
-                               bool bStdCS = false,
-                               uint32_t GroupFamily = 0,
-                               bool bLoadMask = false) const;
+  std::unique_ptr<CFX_DIBSource> LoadDIBSource(CFX_DIBSource** ppMask = nullptr,
+                                               uint32_t* pMatteColor = nullptr,
+                                               bool bStdCS = false,
+                                               uint32_t GroupFamily = 0,
+                                               bool bLoadMask = false) const;
 
   void SetImage(const CFX_DIBitmap* pDIBitmap);
   void SetJpegImage(const CFX_RetainPtr<IFX_SeekableReadStream>& pFile);
   void SetJpegImageInline(const CFX_RetainPtr<IFX_SeekableReadStream>& pFile);
 
   void ResetCache(CPDF_Page* pPage, const CFX_DIBitmap* pDIBitmap);
 
   bool StartLoadDIBSource(CPDF_Dictionary* pFormResource,
                           CPDF_Dictionary* pPageResource,
                           bool bStdCS = false,
@@ skipping 16 matching lines @@
   bool m_bIsInline = false;
   bool m_bIsMask = false;
   bool m_bInterpolate = false;
   CPDF_Document* const m_pDocument;
   CFX_MaybeOwned<CPDF_Stream> m_pStream;
   CFX_MaybeOwned<CPDF_Dictionary> m_pDict;
   CPDF_Dictionary* m_pOC = nullptr;
 };
 
 #endif  // CORE_FPDFAPI_PAGE_CPDF_IMAGE_H_