Make down-conversion explicit from CFX_Widetring to CFX_WideStringC.

xfa/fwl/basewidget/fwl_editimp.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/fwl/basewidget/fwl_editimp.h"
 
 #include <algorithm>
 #include <vector>
@@ skipping 405 matching lines @@
       break;
     }
   }
   int32_t nDestLen = bsReplace.GetLength();
   CFX_WideString wsDest;
   FX_WCHAR* pBuffer = wsDest.GetBuffer(nDestLen);
   for (int32_t i = 0; i < nDestLen; i++) {
     pBuffer[i] = bsReplace[i];
   }
   wsDest.ReleaseBuffer(nDestLen);
-  Replace(nWordStart, nWordCount, wsDest);
+  Replace(nWordStart, nWordCount, wsDest.AsWideStringC());
   return TRUE;
 }
 void CFWL_EditImp::DrawSpellCheck(CFX_Graphics* pGraphics,
                                   const CFX_Matrix* pMatrix) {
   pGraphics->SaveGraphState();
   if (pMatrix) {
     pGraphics->ConcatMatrix(const_cast<CFX_Matrix*>(pMatrix));
   }
   FX_ARGB cr = 0xFFFF0000;
   CFX_Color crLine(cr);
@@ skipping 1733 matching lines @@
     }
     CFX_RectF rect;
     m_pOwner->GetWidgetRect(rect);
     CFX_RectF rtInvalidate;
     rtInvalidate.Set(0, 0, rect.width + 2, rect.height + 2);
     m_pOwner->Repaint(&rtInvalidate);
   }
   return TRUE;
 }
 void CFWL_EditImpDelegate::DoCursor(CFWL_MsgMouse* pMsg) {}