Make CPDF_Image() constructors saner.

core/fpdfapi/parser/cpdf_array.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_PARSER_CPDF_ARRAY_H_
 #define CORE_FPDFAPI_PARSER_CPDF_ARRAY_H_
 
 #include <set>
@@ skipping 51 matching lines @@
 
  protected:
   ~CPDF_Array() override;
 
   CPDF_Object* CloneNonCyclic(
       bool bDirect,
       std::set<const CPDF_Object*>* pVisited) const override;
 
   std::vector<CPDF_Object*> m_Objects;
 };
+using UniqueArray = std::unique_ptr<CPDF_Array, ReleaseDeleter<CPDF_Object>>;
 
 inline CPDF_Array* ToArray(CPDF_Object* obj) {
   return obj ? obj->AsArray() : nullptr;
 }
 
 inline const CPDF_Array* ToArray(const CPDF_Object* obj) {
   return obj ? obj->AsArray() : nullptr;
 }
 
+inline UniqueArray ToArray(UniqueObject obj) {
+  CPDF_Array* pArray = ToArray(obj.get());
+  if (!pArray)
+    return nullptr;
+  obj.release();
+  return UniqueArray(pArray);
+}
+
 #endif  // CORE_FPDFAPI_PARSER_CPDF_ARRAY_H_