Make CPDF_Object containers hold objects via unique pointers

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>
 #include <vector>
 
 #include "core/fpdfapi/parser/cpdf_indirect_object_holder.h"
 #include "core/fpdfapi/parser/cpdf_object.h"
 #include "core/fxcrt/fx_basic.h"
 #include "core/fxcrt/fx_coordinates.h"
 
 class CPDF_Array : public CPDF_Object {
  public:
-  using iterator = std::vector<CPDF_Object*>::iterator;
-  using const_iterator = std::vector<CPDF_Object*>::const_iterator;
+  using iterator = std::vector<UniqueObject>::iterator;
+  using const_iterator = std::vector<UniqueObject>::const_iterator;
 
   CPDF_Array();
 
   // CPDF_Object.
   Type GetType() const override;
   CPDF_Object* Clone() const override;
   bool IsArray() const override;
   CPDF_Array* AsArray() override;
   const CPDF_Array* AsArray() const override;
 
@@ skipping 28 matching lines @@
   const_iterator begin() const { return m_Objects.begin(); }
   const_iterator end() const { return m_Objects.end(); }
 
  protected:
   ~CPDF_Array() override;
 
   CPDF_Object* CloneNonCyclic(
       bool bDirect,
       std::set<const CPDF_Object*>* pVisited) const override;
 
-  std::vector<CPDF_Object*> m_Objects;
+  std::vector<UniqueObject> 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_