Make GetDevFont() return a CFX_Font* instead of void*

xfa/fgas/font/fgas_font.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 XFA_FGAS_FONT_FGAS_FONT_H_
 #define XFA_FGAS_FONT_FGAS_FONT_H_
 
 #include "core/fxge/include/fx_font.h"
@@ skipping 70 matching lines @@
                                 FX_BOOL bCharCode = FALSE) = 0;
   virtual int32_t GetAscent() const = 0;
   virtual int32_t GetDescent() const = 0;
   virtual FX_BOOL GetCharBBox(FX_WCHAR wUnicode,
                               CFX_Rect& bbox,
                               FX_BOOL bCharCode = FALSE) = 0;
   virtual FX_BOOL GetBBox(CFX_Rect& bbox) = 0;
   virtual int32_t GetItalicAngle() const = 0;
   virtual void Reset() = 0;
   virtual IFGAS_Font* GetSubstFont(int32_t iGlyphIndex) const = 0;
-  virtual void* GetDevFont() const = 0;
+  virtual CFX_Font* GetDevFont() const = 0;
   virtual void SetFontProvider(CXFA_PDFFontMgr* pProvider) = 0;
 #if _FXM_PLATFORM_ != _FXM_PLATFORM_WINDOWS_
   virtual void SetLogicalFontStyle(uint32_t dwLogFontStyle) = 0;
 #endif
 };
 
 #if _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_
 struct FX_FONTMATCHPARAMS {
   const FX_WCHAR* pwsFamily;
   uint32_t dwFontStyles;
@@ skipping 136 matching lines @@
                                int32_t iFaceIndex,
                                int32_t* pFaceCount = NULL,
                                FX_BOOL bSaveStream = FALSE) = 0;
 
   virtual void ClearFontCache() = 0;
   virtual void RemoveFont(IFGAS_Font* pFont) = 0;
 };
 #endif  //  _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_
 
 #endif  // XFA_FGAS_FONT_FGAS_FONT_H_