Remove no-op ShowFileDialog(s).

fpdfsdk/fpdfxfa/include/fpdfxfa_app.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_FPDFXFA_INCLUDE_FPDFXFA_APP_H_
 #define FPDFSDK_FPDFXFA_INCLUDE_FPDFXFA_APP_H_
 
 #include "xfa/fxfa/include/fxfa.h"
@@ skipping 58 matching lines @@
                          const CFX_WideStringC& wsData,
                          const CFX_WideStringC& wsContentType,
                          const CFX_WideStringC& wsEncode,
                          const CFX_WideStringC& wsHeader,
                          CFX_WideString& wsResponse) override;
   FX_BOOL PutRequestURL(const CFX_WideStringC& wsURL,
                         const CFX_WideStringC& wsData,
                         const CFX_WideStringC& wsEncode) override;
 
   void LoadString(int32_t iStringID, CFX_WideString& wsString) override;
-  FX_BOOL ShowFileDialog(const CFX_WideStringC& wsTitle,
-                         const CFX_WideStringC& wsFilter,
-                         CFX_WideStringArray& wsPathArr,
-                         FX_BOOL bOpen) override;
   IFWL_AdapterTimerMgr* GetTimerMgr() override;
 
   CFX_ArrayTemplate<CPDFDoc_Environment*> m_pEnvList;
 
  protected:
   static CPDFXFA_App* g_pApp;
 
   FX_BOOL m_bJavaScriptInitialized;
   CXFA_FFApp* m_pXFAApp;
   FXJSE_HRUNTIME m_hJSERuntime;
   IFXJS_Runtime* m_pJSRuntime;
   CFX_WideString m_csAppType;
   bool m_bOwnedRuntime;
 };
 
 #endif  // FPDFSDK_FPDFXFA_INCLUDE_FPDFXFA_APP_H_