Revert postscript code removal.

core/fxge/cfx_windowsdevice.h

 // Copyright 2016 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 CORE_FXGE_CFX_WINDOWSDEVICE_H_
 #define CORE_FXGE_CFX_WINDOWSDEVICE_H_
 
 #ifdef _WIN32
 #ifndef _WINDOWS_
 #include <windows.h>
 #endif
 
+#include "core/fxge/cfx_renderdevice.h"
+
 class IFX_RenderDeviceDriver;
 
 #if defined(PDFIUM_PRINT_TEXT_WITH_GDI)
 typedef void (*PDFiumEnsureTypefaceCharactersAccessible)(const LOGFONT* font,
                                                          const wchar_t* text,
                                                          size_t text_length);
 
 extern bool g_pdfium_print_text_with_gdi;
 extern PDFiumEnsureTypefaceCharactersAccessible
     g_pdfium_typeface_accessible_func;
 #endif
 
 class CFX_WindowsDevice : public CFX_RenderDevice {
  public:
   static IFX_RenderDeviceDriver* CreateDriver(HDC hDC);
 
   explicit CFX_WindowsDevice(HDC hDC);
   ~CFX_WindowsDevice() override;
 
   HDC GetDC() const;
 };
 
 #endif  // _WIN32
 
 #endif  // CORE_FXGE_CFX_WINDOWSDEVICE_H_