Make down-conversion explicit from CFX_Widetring to CFX_WideStringC.

xfa/fxfa/app/xfa_ffwidget.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/include/fxfa/xfa_ffwidget.h"
 
 #include <algorithm>
 
@@ skipping 926 matching lines @@
       out[j++] = g_base64_chars[(limb >> 4) & 63];
       out[j++] = g_base64_chars[(limb << 2) & 63];
       out[j++] = '=';
       break;
     default:
       break;
   }
   out[j] = '\0';
   return out;
 }
-FXCODEC_IMAGE_TYPE XFA_GetImageType(const CFX_WideStringC& wsType) {
+FXCODEC_IMAGE_TYPE XFA_GetImageType(const CFX_WideString& wsType) {
   CFX_WideString wsContentType(wsType);
   wsContentType.MakeLower();
   if (wsContentType == FX_WSTRC(L"image/jpg")) {
     return FXCODEC_IMAGE_JPG;
   }
   if (wsContentType == FX_WSTRC(L"image/png")) {
     return FXCODEC_IMAGE_PNG;
   }
   if (wsContentType == FX_WSTRC(L"image/gif")) {
     return FXCODEC_IMAGE_GIF;
@@ skipping 38 matching lines @@
     } else {
       bsContent = CFX_ByteString::FromUnicode(wsImage);
       pImageFileRead = FX_CreateMemoryStream(
           (uint8_t*)(const uint8_t*)bsContent, bsContent.GetLength());
     }
   } else {
     CFX_WideString wsURL = wsHref;
     if (wsURL.Left(7) != FX_WSTRC(L"http://") &&
         wsURL.Left(6) != FX_WSTRC(L"ftp://")) {
       CFX_DIBitmap* pBitmap =
-          pDoc->GetPDFNamedImage(wsURL, iImageXDpi, iImageYDpi);
+          pDoc->GetPDFNamedImage(wsURL.AsWideStringC(), iImageXDpi, iImageYDpi);
       if (pBitmap) {
         bNameImage = TRUE;
         return pBitmap;
       }
     }
     pImageFileRead = pDoc->GetDocProvider()->OpenLinkedFile(pDoc, wsURL);
   }
   if (!pImageFileRead) {
     FX_Free(pImageBuffer);
     return NULL;
@@ skipping 939 matching lines @@
       iType != XFA_ELEMENT_Rectangle) {
     return;
   }
   CXFA_StrokeArray strokes;
   if (!(dwFlags & XFA_DRAWBOX_ForceRound) && iType != XFA_ELEMENT_Arc) {
     box.GetStrokes(strokes);
   }
   XFA_BOX_Fill(box, strokes, pGS, rtWidget, pMatrix, dwFlags);
   XFA_BOX_Stroke(box, strokes, pGS, rtWidget, pMatrix, dwFlags);
 }