XFA: merge patch from CL 733693003, getting rid of more casts

core/src/fpdfapi/fpdf_parser/fpdf_parser_fdf.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 "../../../include/fpdfapi/fpdf_serial.h"
 CFDF_Document::CFDF_Document() : CPDF_IndirectObjects(NULL)
 {
     m_pRootDict = NULL;
@@ skipping 157 matching lines @@
 }
 void FPDF_FileSpec_SetWin32Path(CPDF_Object* pFileSpec, const CFX_WideString& filepath)
 {
     CFX_WideString result;
     if (filepath.GetLength() > 1 && filepath[1] == ':') {
         result = L"/";
         result += filepath[0];
         if (filepath[2] != '\\') {
             result += '/';
         }
-        result += ChangeSlash((FX_LPCWSTR)filepath + 2);
+        result += ChangeSlash(filepath.c_str() + 2);
     } else if (filepath.GetLength() > 1 && filepath[0] == '\\' && filepath[1] == '\\') {
-        result = ChangeSlash((FX_LPCWSTR)filepath + 1);
+        result = ChangeSlash(filepath.c_str() + 1);
     } else {
         result = ChangeSlash(filepath);
     }
     if (pFileSpec->GetType() == PDFOBJ_STRING) {
         pFileSpec->SetString(CFX_ByteString::FromUnicode(result));
     } else if (pFileSpec->GetType() == PDFOBJ_DICTIONARY) {
         ((CPDF_Dictionary*)pFileSpec)->SetAtString(FX_BSTRC("F"), CFX_ByteString::FromUnicode(result));
         ((CPDF_Dictionary*)pFileSpec)->SetAtString(FX_BSTRC("UF"), PDF_EncodeText(result));
         ((CPDF_Dictionary*)pFileSpec)->RemoveAt(FX_BSTRC("FS"));
     }
@@ skipping 19 matching lines @@
     else {
         wsFileName = CFX_WideString::FromLocal(pFileSpec->GetString());
     }
     if (wsFileName[0] != '/') {
         return ChangeSlash(wsFileName);
     }
     if (wsFileName[2] == '/') {
         CFX_WideString result;
         result += wsFileName[1];
         result += ':';
-        result += ChangeSlash(((FX_LPCWSTR)wsFileName) + 2);
+        result += ChangeSlash(wsFileName.c_str() + 2);
         return result;
     } else {
         CFX_WideString result;
         result += '\\';
         result += ChangeSlash(wsFileName);
         return result;
     }
 }