Cleanup forward declarations.

xfa/include/fxfa/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_INCLUDE_FXFA_FXFA_H_
 #define XFA_INCLUDE_FXFA_FXFA_H_
 
 #include <vector>
 
 #include "xfa/include/fxfa/fxfa_basic.h"
 #include "xfa/include/fxfa/fxfa_widget.h"
 
 class CFX_Graphics;
 class CPDF_Document;
 class CXFA_Node;
 class CXFA_NodeList;
 class CXFA_WidgetAcc;
-class IFDE_XMLElement;
 class IFWL_AdapterTimerMgr;
 class IFX_Font;
 class IXFA_App;
 class IXFA_AppProvider;
 class IXFA_ChecksumContext;
 class IXFA_DocHandler;
 class IXFA_DocProvider;
 class IXFA_DocView;
 class IXFA_FontMgr;
 class IXFA_MenuHandler;
 class IXFA_PageView;
-class IXFA_PageViewRender;
 class IXFA_WidgetAccIterator;
 class IXFA_WidgetHandler;
 class IXFA_WidgetIterator;
 
 class IXFA_Doc {
  public:
   virtual ~IXFA_Doc() {}
 
  protected:
   IXFA_Doc() {}
@@ skipping 795 matching lines @@
                                  size_t size = 0) = 0;
   virtual void FinishChecksum() = 0;
   virtual void GetChecksum(CFX_ByteString& bsChecksum) = 0;
 
  protected:
   ~IXFA_ChecksumContext() {}
 };
 IXFA_ChecksumContext* XFA_Checksum_Create();
 
 #endif  // XFA_INCLUDE_FXFA_FXFA_H_