Use std::vector as internal storage for CPDF_Array

core/fpdfdoc/doc_tagged.cpp

 // Copyright 2014 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 <map>
 
 #include "core/fpdfapi/fpdf_parser/include/cpdf_array.h"
 #include "core/fpdfapi/fpdf_parser/include/cpdf_dictionary.h"
@@ skipping 52 matching lines @@
   if (CPDF_Dictionary* pDict = pKids->AsDictionary()) {
     CPDF_StructElementImpl* pStructElementImpl =
         new CPDF_StructElementImpl(this, nullptr, pDict);
     m_Kids.Add(pStructElementImpl);
     return;
   }
   CPDF_Array* pArray = pKids->AsArray();
   if (!pArray)
     return;
 
-  for (uint32_t i = 0; i < pArray->GetCount(); i++) {
+  for (size_t i = 0; i < pArray->GetCount(); i++) {
     CPDF_Dictionary* pKid = pArray->GetDictAt(i);
     CPDF_StructElementImpl* pStructElementImpl =
         new CPDF_StructElementImpl(this, nullptr, pKid);
     m_Kids.Add(pStructElementImpl);
   }
 }
 void CPDF_StructTreeImpl::LoadPageTree(const CPDF_Dictionary* pPageDict) {
   m_pPage = pPageDict;
   if (!m_pTreeRoot)
     return;
@@ skipping 350 matching lines @@
   return ToNumber(pAttr) ? pAttr->GetNumber() : default_value;
 }
 int CPDF_StructElementImpl::GetInteger(const CFX_ByteStringC& owner,
                                        const CFX_ByteStringC& name,
                                        int default_value,
                                        FX_BOOL bInheritable,
                                        int subindex) {
   CPDF_Object* pAttr = GetAttr(owner, name, bInheritable, subindex);
   return ToNumber(pAttr) ? pAttr->GetInteger() : default_value;
 }