Make CPDF_Dictionary use unique pointers.

core/fpdfapi/parser/cpdf_data_avail.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/parser/cpdf_data_avail.h"
 
 #include <algorithm>
 #include <memory>
@@ skipping 124 matching lines @@
           new_obj_array.push_back(pArray->GetObjectAt(k));
       } break;
       case CPDF_Object::STREAM:
         pObj = pObj->GetDict();
       case CPDF_Object::DICTIONARY: {
         CPDF_Dictionary* pDict = pObj->GetDict();
         if (pDict && pDict->GetStringFor("Type") == "Page" && !bParsePage)
           continue;
 
         for (const auto& it : *pDict) {
-          const CFX_ByteString& key = it.first;
-          CPDF_Object* value = it.second;
-          if (key != "Parent")
-            new_obj_array.push_back(value);
+          if (it.first != "Parent")
+            new_obj_array.push_back(it.second.get());
         }
       } break;
       case CPDF_Object::REFERENCE: {
         CPDF_Reference* pRef = pObj->AsReference();
         uint32_t dwNum = pRef->GetRefObjNum();
 
         FX_FILESIZE offset;
         uint32_t size = GetObjectSize(dwNum, offset);
         if (size == 0 || offset < 0 || offset >= m_dwFileLen)
           break;
@@ skipping 1541 matching lines @@
   return AreObjectsAvailable(obj_array, true, nullptr, dummy);
 }
 
 CPDF_DataAvail::PageNode::PageNode() : m_type(PDF_PAGENODE_UNKNOWN) {}
 
 CPDF_DataAvail::PageNode::~PageNode() {
   for (int32_t i = 0; i < m_childNode.GetSize(); ++i)
     delete m_childNode[i];
   m_childNode.RemoveAll();
 }