Make down-conversion explicit from CFX_Widetring to CFX_WideStringC.

fpdfsdk/fpdfxfa/fpdfxfa_doc.cpp

Index: fpdfsdk/fpdfxfa/fpdfxfa_doc.cpp
diff --git a/fpdfsdk/fpdfxfa/fpdfxfa_doc.cpp b/fpdfsdk/fpdfxfa/fpdfxfa_doc.cpp
index fbc05bd9aaedfd84ef5b8d3ec7497ab2a9ac084b..bb8793f1a7ce1578af68140f86d6866e09da2845 100644
--- a/fpdfsdk/fpdfxfa/fpdfxfa_doc.cpp
+++ b/fpdfsdk/fpdfxfa/fpdfxfa_doc.cpp
@@ -957,7 +957,7 @@ FX_BOOL CPDFXFA_Document::_ExportSubmitFile(FPDF_FILEHANDLER* pFileHandler,
     ws.FromLocal("data");
     CFX_ByteString content = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\r\n";
     fileStream.WriteBlock((const FX_CHAR*)content, 0, content.GetLength());
-    m_pXFADoc->SavePackage(ws, &fileStream);
+    m_pXFADoc->SavePackage(ws.AsWideStringC(), &fileStream);
   } else if (fileType == FXFA_SAVEAS_XDP) {
     if (flag == 0)
       flag = FXFA_CONFIG | FXFA_TEMPLATE | FXFA_LOCALESET | FXFA_DATASETS |
@@ -1018,11 +1018,11 @@ FX_BOOL CPDFXFA_Document::_ExportSubmitFile(FPDF_FILEHANDLER* pFileHandler,
       if (pPrePDFObj->GetString() == "form") {
         CFX_WideString ws;
         ws.FromLocal("form");
-        m_pXFADoc->SavePackage(ws, &fileStream);
+        m_pXFADoc->SavePackage(ws.AsWideStringC(), &fileStream);
       } else if (pPrePDFObj->GetString() == "datasets") {
         CFX_WideString ws;
         ws.FromLocal("datasets");
-        m_pXFADoc->SavePackage(ws, &fileStream);
+        m_pXFADoc->SavePackage(ws.AsWideStringC(), &fileStream);
       } else {
         // PDF,creator.
       }