Refactor fxge/fx_apple and fx_win header files

core/fxge/include/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_INCLUDE_CFX_WINDOWSDEVICE_H_
+#define CORE_FXGE_INCLUDE_CFX_WINDOWSDEVICE_H_
+
+#ifdef _WIN32
+#ifndef _WINDOWS_
+#include <windows.h>
+#endif
+
+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_INCLUDE_CFX_WINDOWSDEVICE_H_