Use string pools in some dictionaries

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 52 matching lines @@
   DInfoDict->SetFor("Producer", new CPDF_String(producerstr, FALSE));
 
   CFX_ByteString cbRootType = pNewRoot->GetStringFor("Type", "");
   if (cbRootType.IsEmpty())
     pNewRoot->SetFor("Type", new CPDF_Name("Catalog"));
 
   CPDF_Object* pElement = pNewRoot->GetObjectFor("Pages");
   CPDF_Dictionary* pNewPages =
       pElement ? ToDictionary(pElement->GetDirect()) : nullptr;
   if (!pNewPages) {
-    pNewPages = new CPDF_Dictionary;
+    pNewPages = new CPDF_Dictionary(pDestPDFDoc->GetByteStringPool());
     pNewRoot->SetReferenceFor("Pages", pDestPDFDoc,
                               pDestPDFDoc->AddIndirectObject(pNewPages));
   }
 
   CFX_ByteString cbPageType = pNewPages->GetStringFor("Type", "");
   if (cbPageType == "") {
     pNewPages->SetFor("Type", new CPDF_Name("Pages"));
   }
 
   if (!pNewPages->GetArrayFor("Kids")) {
@@ skipping 312 matching lines @@
   if (!pSrcDict)
     return FALSE;
 
   CPDF_Dictionary* pDstDict = pDstDoc->GetRoot();
   if (!pDstDict)
     return FALSE;
 
   pDstDict->SetFor("ViewerPreferences", pSrcDict->CloneDirectObject());
   return TRUE;
 }