Cleanup some PWL interfaces.

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/fsdk_common.h"
@@ skipping 261 matching lines @@
     pEdit->SetCharSet(FXFONT_GB2312_CHARSET);
     pEdit->SetCodePage(936);
 
     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);
-
-    pEdit->SetEditNotify(this);
   }
 }
-
-void CFFL_TextField::OnKillFocus(CPWL_Wnd* pWnd) {}
-
-void CFFL_TextField::OnAddUndo(CPWL_Edit* pEdit) {}