Pass CFX_WideString further down widget callers

fpdfsdk/formfiller/cffl_iformfiller.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 "fpdfsdk/formfiller/cffl_iformfiller.h"
 
 #include "core/fpdfapi/fpdf_page/include/cpdf_page.h"
 #include "core/fpdfapi/fpdf_parser/include/cpdf_document.h"
@@ skipping 706 matching lines @@
     CPDFSDK_InterForm* pInterForm = pDocument->GetInterForm();
 
     FX_BOOL bFormatted = FALSE;
     CFX_WideString sValue =
         pInterForm->OnFormat(pWidget->GetFormField(), bFormatted);
 
     if (bExit)
       return;
 
     if (bFormatted) {
-      pInterForm->ResetFieldAppearance(pWidget->GetFormField(), sValue.c_str(),
-                                       TRUE);
+      pInterForm->ResetFieldAppearance(pWidget->GetFormField(), &sValue, TRUE);
       pInterForm->UpdateField(pWidget->GetFormField());
     }
 
     m_bNotifying = FALSE;
   }
 }
 
 #ifdef PDF_ENABLE_XFA
 void CFFL_IFormFiller::OnClick(CPDFSDK_Widget* pWidget,
                                CPDFSDK_PageView* pPageView,
@@ skipping 258 matching lines @@
           bExit = TRUE;
           m_bNotifying = FALSE;
           return;
         }
       }
 
       m_bNotifying = FALSE;
     }
   }
 }