Remove implicit cast from CFX_WideString to (const wchar_t*)

xfa/fxfa/app/xfa_ffdoc.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 "xfa/fxfa/include/xfa_ffdoc.h"
 
 #include "core/fpdfapi/fpdf_parser/include/cpdf_array.h"
 #include "core/fpdfapi/fpdf_parser/include/cpdf_document.h"
@@ skipping 69 matching lines @@
         pChunkElement = pXMLElement;
         break;
       }
     }
   }
   if (!pChunkElement) {
     return FALSE;
   }
   CFX_WideString wsPDFContent;
   pChunkElement->GetTextData(wsPDFContent);
-  iBufferSize = FX_Base64DecodeW(wsPDFContent, wsPDFContent.GetLength(), NULL);
+  iBufferSize =
+      FX_Base64DecodeW(wsPDFContent.c_str(), wsPDFContent.GetLength(), NULL);
   pByteBuffer = FX_Alloc(uint8_t, iBufferSize + 1);
   pByteBuffer[iBufferSize] = '0';  // FIXME: I bet this is wrong.
-  FX_Base64DecodeW(wsPDFContent, wsPDFContent.GetLength(), pByteBuffer);
+  FX_Base64DecodeW(wsPDFContent.c_str(), wsPDFContent.GetLength(), pByteBuffer);
   return TRUE;
 }
 void XFA_XPDPacket_MergeRootNode(CXFA_Node* pOriginRoot, CXFA_Node* pNewRoot) {
   CXFA_Node* pChildNode = pNewRoot->GetNodeItem(XFA_NODEITEM_FirstChild);
   while (pChildNode) {
     CXFA_Node* pOriginChild =
         pOriginRoot->GetFirstChildByName(pChildNode->GetNameHash());
     if (pOriginChild) {
       pChildNode = pChildNode->GetNodeItem(XFA_NODEITEM_NextSibling);
     } else {
@@ skipping 315 matching lines @@
   }
   pExport->Release();
   return bFlags;
 }
 FX_BOOL CXFA_FFDoc::ImportData(IFX_FileRead* pStream, FX_BOOL bXDP) {
   std::unique_ptr<CXFA_DataImporter, ReleaseDeleter<CXFA_DataImporter>>
       importer(new CXFA_DataImporter(m_pDocument));
 
   return importer->ImportData(pStream);
 }