Remove dead code found by Scythe.

fpdfsdk/src/formfiller/FFL_FormFiller.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 "../../include/formfiller/FFL_FormFiller.h"
 #include "../../include/formfiller/FFL_Notify.h"
 #include "../../include/formfiller/FFL_CBA_Fontmap.h"
@@ skipping 587 matching lines @@
 
 FX_BOOL CFFL_FormFiller::IsDataChanged(CPDFSDK_PageView* pPageView)
 {
     return FALSE;
 }
 
 void CFFL_FormFiller::SaveData(CPDFSDK_PageView* pPageView)
 {
 }
 
-void CFFL_FormFiller::GetKeyStrokeData(CPDFSDK_PageView* pPageView, FFL_KeyStrokeData& data)
-{
-}
-
 void CFFL_FormFiller::SetChangeMark()
 {
     m_pApp->FFI_OnChange();
 }
 
 void CFFL_FormFiller::GetActionData(CPDFSDK_PageView* pPageView, CPDF_AAction::AActionType type,
                             PDFSDK_FieldAction& fa)
 {
     fa.sValue = m_pWidget->GetValue();
 }
@@ skipping 179 matching lines @@
         pWidget->DrawAppearance(pDevice, pUser2Device, CPDF_Annot::Normal, NULL);
 }
 
 
 void CFFL_Button::OnDrawDeactive(CPDFSDK_PageView *pPageView, CPDFSDK_Annot* pAnnot,
                                  CFX_RenderDevice* pDevice, CPDF_Matrix* pUser2Device,
                                  FX_DWORD dwFlags)
 {
     OnDraw(pPageView, pAnnot, pDevice, pUser2Device, dwFlags);
 }