Make down-conversion explicit from CFX_ByteString to CFX_ByteStringC.

xfa/fxfa/app/xfa_fftextedit.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/app/xfa_fftextedit.h"
 
 #include <vector>
 
@@ skipping 402 matching lines @@
       OnTextChanged(m_pNormalWidget->GetWidget(), wsChange, event->wsPrevText);
       break;
     }
     case FWL_EVTHASH_EDT_TextFull: {
       OnTextFull(m_pNormalWidget->GetWidget());
       break;
     }
     case FWL_EVTHASH_EDT_CheckWord: {
       CFX_WideString wstr(L"FWL_EVENT_DTP_SelectChanged");
       CFWL_EvtEdtCheckWord* event = (CFWL_EvtEdtCheckWord*)pEvent;
-      event->bCheckWord = CheckWord(event->bsWord);
+      event->bCheckWord = CheckWord(event->bsWord.AsByteStringC());
       break;
     }
     case FWL_EVTHASH_EDT_GetSuggestWords: {
       CFWL_EvtEdtGetSuggestWords* event = (CFWL_EvtEdtGetSuggestWords*)pEvent;
-      event->bSuggestWords =
-          GetSuggestWords(event->bsWord, event->bsArraySuggestWords);
+      event->bSuggestWords = GetSuggestWords(event->bsWord.AsByteStringC(),
+                                             event->bsArraySuggestWords);
       break;
     }
     default: {}
   }
   return m_pOldDelegate->OnProcessEvent(pEvent);
 }
 FWL_ERR CXFA_FFTextEdit::OnDrawWidget(CFX_Graphics* pGraphics,
                                       const CFX_Matrix* pMatrix) {
   return m_pOldDelegate->OnDrawWidget(pGraphics, pMatrix);
 }
@@ skipping 349 matching lines @@
   uint32_t dwEventID = pEvent->GetClassID();
   if (dwEventID == FWL_EVTHASH_DTP_SelectChanged) {
     CFWL_Event_DtpSelectChanged* event = (CFWL_Event_DtpSelectChanged*)pEvent;
     OnSelectChanged(m_pNormalWidget->GetWidget(), event->iYear, event->iMonth,
                     event->iDay);
     return TRUE;
   } else {
     return CXFA_FFTextEdit::OnProcessEvent(pEvent);
   }
 }