Replace IFGAS_Font with underlying concrete type

xfa/fxfa/include/fxfa.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_FXFA_INCLUDE_FXFA_H_
 #define XFA_FXFA_INCLUDE_FXFA_H_
 
 #include <vector>
 
 #include "xfa/fxfa/include/fxfa_basic.h"
 #include "xfa/fxfa/include/fxfa_widget.h"
 
+class CFGAS_GEFont;
 class CFX_Graphics;
 class CPDF_Document;
 class CXFA_FFPageView;
 class CXFA_Node;
 class CXFA_NodeList;
 class CXFA_WidgetAcc;
 class IFWL_AdapterTimerMgr;
-class IFGAS_Font;
 class IXFA_AppProvider;
 class IXFA_DocProvider;
 class IXFA_WidgetAccIterator;
 class IXFA_WidgetIterator;
 
 #define XFA_MBICON_Error 0
 #define XFA_MBICON_Warning 1
 #define XFA_MBICON_Question 2
 #define XFA_MBICON_Status 3
 #define XFA_MB_OK 0
@@ skipping 465 matching lines @@
   virtual void Reset() = 0;
   virtual CXFA_FFWidget* MoveToFirst() = 0;
   virtual CXFA_FFWidget* MoveToLast() = 0;
   virtual CXFA_FFWidget* MoveToNext() = 0;
   virtual CXFA_FFWidget* MoveToPrevious() = 0;
   virtual CXFA_FFWidget* GetCurrentWidget() = 0;
   virtual FX_BOOL SetCurrentWidget(CXFA_FFWidget* hWidget) = 0;
 };
 
 #endif  // XFA_FXFA_INCLUDE_FXFA_H_