Make down-conversion explicit from CFX_ByteString to CFX_ByteStringC.

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 716 matching lines @@
   if (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_NoRedoUndo) {
     return TRUE;
   }
   return m_pEdtEngine->Undo(bsRecord);
 }
 FX_BOOL CFWL_EditImp::Undo() {
   if (!CanUndo()) {
     return FALSE;
   }
   CFX_ByteString bsRecord = m_RecordArr[m_iCurRecord--];
-  return Undo(bsRecord);
+  return Undo(bsRecord.AsByteStringC());
 }
 FX_BOOL CFWL_EditImp::Redo() {
   if (!CanRedo()) {
     return FALSE;
   }
   CFX_ByteString bsRecord = m_RecordArr[++m_iCurRecord];
-  return Redo(bsRecord);
+  return Redo(bsRecord.AsByteStringC());
 }
 FX_BOOL CFWL_EditImp::CanUndo() {
   return m_iCurRecord >= 0;
 }
 FX_BOOL CFWL_EditImp::CanRedo() {
   return m_iCurRecord < m_RecordArr.GetSize() - 1;
 }
 FWL_ERR CFWL_EditImp::SetTabWidth(FX_FLOAT fTabWidth, FX_BOOL bEquidistant) {
   if (!m_pEdtEngine)
     return FWL_ERR_Succeeded;
@@ skipping 1415 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) {}