Use std::vector as internal storage for CPDF_Array

fpdfsdk/fpdfppo.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 "public/fpdf_ppo.h"
 
 #include <map>
 #include <memory>
@@ skipping 220 matching lines @@
           if (!UpdateReference(pNextObj, pDoc, pObjNumberMap))
             pDict->RemoveAt(key.AsByteStringC());
         } else {
           return FALSE;
         }
       }
       break;
     }
     case CPDF_Object::ARRAY: {
       CPDF_Array* pArray = pObj->AsArray();
-      uint32_t count = pArray->GetCount();
-      for (uint32_t i = 0; i < count; ++i) {
+      for (size_t i = 0; i < pArray->GetCount(); ++i) {
         CPDF_Object* pNextObj = pArray->GetObjectAt(i);
         if (!pNextObj)
           return FALSE;
         if (!UpdateReference(pNextObj, pDoc, pObjNumberMap))
           return FALSE;
       }
       break;
     }
     case CPDF_Object::STREAM: {
       CPDF_Stream* pStream = pObj->AsStream();
@@ skipping 150 matching lines @@
   if (!pSrcDict)
     return FALSE;
 
   CPDF_Dictionary* pDstDict = pDstDoc->GetRoot();
   if (!pDstDict)
     return FALSE;
 
   pDstDict->SetAt("ViewerPreferences", pSrcDict->Clone(TRUE));
   return TRUE;
 }