Remove unused code.

fpdfsdk/pdfwindow/PWL_Signature.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_PDFWINDOW_PWL_SIGNATURE_H_
-#define FPDFSDK_PDFWINDOW_PWL_SIGNATURE_H_
-
-#include "fpdfsdk/pdfwindow/PWL_Icon.h"
-#include "fpdfsdk/pdfwindow/PWL_Wnd.h"
-
-class CFX_DIBSource;
-class CPWL_Label;
-
-class CPWL_Signature_Image : public CPWL_Image {
- public:
-  CPWL_Signature_Image();
-  ~CPWL_Signature_Image() override;
-
-  void SetImage(CFX_DIBSource* pImage);
-  CFX_DIBSource* GetImage();
-
- protected:
-  // CPWL_Image
-  void DrawThisAppearance(CFX_RenderDevice* pDevice,
-                          CFX_Matrix* pUser2Device) override;
-  void GetThisAppearanceStream(CFX_ByteTextBuf& sAppStream) override;
-  void GetScale(FX_FLOAT& fHScale, FX_FLOAT& fVScale) override;
-
- private:
-  CFX_DIBSource* m_pImage;
-};
-
-class CPWL_Signature : public CPWL_Wnd {
- public:
-  CPWL_Signature();
-  ~CPWL_Signature() override;
-
-  void SetText(const FX_WCHAR* sText);
-  void SetDescription(const FX_WCHAR* str);
-  void SetImage(CFX_DIBSource* pImage);
-  void SetImageStream(CPDF_Stream* pStream, const FX_CHAR* sImageAlias);
-
-  void SetTextFlag(FX_BOOL bTextExist);
-  void SetImageFlag(FX_BOOL bImageExist);
-  void SetFoxitFlag(FX_BOOL bFlagExist);
-
- protected:
-  // CPWL_Wnd
-  void RePosChildWnd() override;
-  void CreateChildWnd(const PWL_CREATEPARAM& cp) override;
-  void DrawThisAppearance(CFX_RenderDevice* pDevice,
-                          CFX_Matrix* pUser2Device) override;
-  void GetThisAppearanceStream(CFX_ByteTextBuf& sAppStream) override;
-
- private:
-  CPWL_Label* m_pText;
-  CPWL_Label* m_pDescription;
-  CPWL_Signature_Image* m_pImage;
-
-  FX_BOOL m_bTextExist;
-  FX_BOOL m_bImageExist;
-  FX_BOOL m_bFlagExist;
-};
-
-#endif  // FPDFSDK_PDFWINDOW_PWL_SIGNATURE_H_