Remove dead code that was reactivated when fixing overrides.

fpdfsdk/include/formfiller/FFL_FormFiller.h

 // 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
 
 #ifndef FPDFSDK_INCLUDE_FORMFILLER_FFL_FORMFILLER_H_
 #define FPDFSDK_INCLUDE_FORMFILLER_FFL_FORMFILLER_H_
 
 #include "FFL_IFormFiller.h"
@@ skipping 85 matching lines @@
   virtual FX_BOOL IsActionDataChanged(CPDF_AAction::AActionType type,
                                       const PDFSDK_FieldAction& faOld,
                                       const PDFSDK_FieldAction& faNew);
 
   virtual void SaveState(CPDFSDK_PageView* pPageView);
   virtual void RestoreState(CPDFSDK_PageView* pPageView);
 
   virtual CPWL_Wnd* ResetPDFWindow(CPDFSDK_PageView* pPageView,
                                    FX_BOOL bRestoreValue);
 
-  virtual void OnKeyStroke(FX_BOOL bKeyDown, FX_DWORD nFlag);
-
   CPDF_Matrix GetCurMatrix();
 
   CPDF_Rect FFLtoPWL(const CPDF_Rect& rect);
   CPDF_Rect PWLtoFFL(const CPDF_Rect& rect);
   CPDF_Point FFLtoPWL(const CPDF_Point& point);
   CPDF_Point PWLtoFFL(const CPDF_Point& point);
 
   CPDF_Point WndtoPWL(CPDFSDK_PageView* pPageView, const CPDF_Point& pt);
   CPDF_Rect FFLtoWnd(CPDFSDK_PageView* pPageView, const CPDF_Rect& rect);
 
@@ skipping 69 matching lines @@
                       CFX_RenderDevice* pDevice,
                       CPDF_Matrix* pUser2Device,
                       FX_DWORD dwFlags) override;
 
  protected:
   FX_BOOL m_bMouseIn;
   FX_BOOL m_bMouseDown;
 };
 
 #endif  // FPDFSDK_INCLUDE_FORMFILLER_FFL_FORMFILLER_H_