Use string pools in some dictionaries

fpdfsdk/fpdfsave.cpp

Index: fpdfsdk/fpdfsave.cpp
diff --git a/fpdfsdk/fpdfsave.cpp b/fpdfsdk/fpdfsave.cpp
index 243ba2a817bc728fc0e7ee8f0ac69a5b044c4c9b..aadedbf691ba4d9c2688b66ebb81e11c084d3ee9 100644
--- a/fpdfsdk/fpdfsave.cpp
+++ b/fpdfsdk/fpdfsave.cpp
@@ -178,7 +178,8 @@ bool SaveXFADocumentData(CPDFXFA_Document* pDocument,
       // Datasets
       pContext->UpdateChecksum(pDsfileWrite.get());
       pContext->FinishChecksum();
-      CPDF_Dictionary* pDataDict = new CPDF_Dictionary;
+      CPDF_Dictionary* pDataDict =
+          new CPDF_Dictionary(pPDFDocument->GetByteStringPool());
       if (iDataSetsIndex != -1) {
         if (pDataSetsStream)
           pDataSetsStream->InitStreamFromFile(pDsfileWrite.get(), pDataDict);
@@ -199,7 +200,8 @@ bool SaveXFADocumentData(CPDFXFA_Document* pDocument,
     if (pXFADocView->GetDoc()->SavePackage(XFA_HASHCODE_Form, pfileWrite.get(),
                                            pContext.get()) &&
         pfileWrite->GetSize() > 0) {
-      CPDF_Dictionary* pDataDict = new CPDF_Dictionary;
+      CPDF_Dictionary* pDataDict =
+          new CPDF_Dictionary(pPDFDocument->GetByteStringPool());
       if (iFormIndex != -1) {
         if (pFormStream)
           pFormStream->InitStreamFromFile(pfileWrite.get(), pDataDict);