Stop converting widestring -> c_str -> widestring in several places.

fpdfsdk/formfiller/cffl_textfield.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_textfield.h"
 
 #include "fpdfsdk/formfiller/cba_fontmap.h"
 #include "fpdfsdk/include/cpdfsdk_widget.h"
@@ skipping 81 matching lines @@
 
   if (nMaxLen > 0) {
     if (pWnd->HasFlag(PES_CHARARRAY)) {
       pWnd->SetCharArray(nMaxLen);
       pWnd->SetAlignFormatV(PEAV_CENTER);
     } else {
       pWnd->SetLimitChar(nMaxLen);
     }
   }
 
-  pWnd->SetText(swValue.c_str());
+  pWnd->SetText(swValue);
   return pWnd;
 }
 
 FX_BOOL CFFL_TextField::OnChar(CPDFSDK_Annot* pAnnot,
                                FX_UINT nChar,
                                FX_UINT nFlags) {
   switch (nChar) {
     case FWL_VKEY_Return:
       if (!(m_pWidget->GetFieldFlags() & FIELDFLAG_MULTILINE)) {
         CPDFSDK_PageView* pPageView = GetCurPageView(true);
@@ skipping 76 matching lines @@
 }
 
 void CFFL_TextField::SetActionData(CPDFSDK_PageView* pPageView,
                                    CPDF_AAction::AActionType type,
                                    const PDFSDK_FieldAction& fa) {
   switch (type) {
     case CPDF_AAction::KeyStroke:
       if (CPWL_Edit* pEdit = (CPWL_Edit*)GetPDFWindow(pPageView, FALSE)) {
         pEdit->SetFocus();
         pEdit->SetSel(fa.nSelStart, fa.nSelEnd);
-        pEdit->ReplaceSel(fa.sChange.c_str());
+        pEdit->ReplaceSel(fa.sChange);
       }
       break;
     default:
       break;
   }
 }
 
 FX_BOOL CFFL_TextField::IsActionDataChanged(CPDF_AAction::AActionType type,
                                             const PDFSDK_FieldAction& faOld,
                                             const PDFSDK_FieldAction& faNew) {
@@ skipping 15 matching lines @@
   if (CPWL_Edit* pWnd = (CPWL_Edit*)GetPDFWindow(pPageView, FALSE)) {
     pWnd->GetSel(m_State.nStart, m_State.nEnd);
     m_State.sValue = pWnd->GetText();
   }
 }
 
 void CFFL_TextField::RestoreState(CPDFSDK_PageView* pPageView) {
   ASSERT(pPageView);
 
   if (CPWL_Edit* pWnd = (CPWL_Edit*)GetPDFWindow(pPageView, TRUE)) {
-    pWnd->SetText(m_State.sValue.c_str());
+    pWnd->SetText(m_State.sValue);
     pWnd->SetSel(m_State.nStart, m_State.nEnd);
   }
 }
 
 CPWL_Wnd* CFFL_TextField::ResetPDFWindow(CPDFSDK_PageView* pPageView,
                                          FX_BOOL bRestoreValue) {
   if (bRestoreValue)
     SaveState(pPageView);
 
   DestroyPDFWindow(pPageView);
@@ skipping 31 matching lines @@
 
     pEdit->SetReadyToInput();
     CFX_WideString wsText = pEdit->GetText();
     int nCharacters = wsText.GetLength();
     CFX_ByteString bsUTFText = wsText.UTF16LE_Encode();
     unsigned short* pBuffer = (unsigned short*)bsUTFText.c_str();
     m_pApp->FFI_OnSetFieldInputFocus(m_pWidget->GetFormField(), pBuffer,
                                      nCharacters, TRUE);
   }
 }