Remove IXFA_* interfaces.

xfa/include/fxfa/xfa_checksum.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_APP_XFA_CHECKSUM_H_
-#define XFA_FXFA_APP_XFA_CHECKSUM_H_
+#ifndef XFA_INCLUDE_FXFA_XFA_CHECKSUM_H_
+#define XFA_INCLUDE_FXFA_XFA_CHECKSUM_H_
 
 #include "xfa/fgas/xml/fgas_sax.h"
 #include "xfa/include/fxfa/fxfa.h"
 
 class CXFA_SAXReaderHandler;
 class CXFA_ChecksumContext;
 
 class CXFA_SAXContext {
  public:
   CXFA_SAXContext() : m_eNode(FX_SAXNODE_Unknown) {}
@@ skipping 25 matching lines @@
                             FX_SAXNODE eType,
                             const CFX_ByteStringC& bsData,
                             uint32_t dwStartPos);
 
  protected:
   void UpdateChecksum(FX_BOOL bCheckSpace);
   CXFA_ChecksumContext* m_pContext;
   CXFA_SAXContext m_SAXContext;
 };
 
-class CXFA_ChecksumContext : public IXFA_ChecksumContext {
+class CXFA_ChecksumContext {
  public:
   CXFA_ChecksumContext();
-  virtual ~CXFA_ChecksumContext();
-  virtual void Release() { delete this; }
-  virtual FX_BOOL StartChecksum();
-  virtual FX_BOOL UpdateChecksum(IFX_FileRead* pSrcFile,
-                                 FX_FILESIZE offset = 0,
-                                 size_t size = 0);
-  virtual void FinishChecksum();
-  virtual void GetChecksum(CFX_ByteString& bsChecksum);
+  ~CXFA_ChecksumContext();
+
+  void Release() { delete this; }
+  FX_BOOL StartChecksum();
+  FX_BOOL UpdateChecksum(IFX_FileRead* pSrcFile,
+                         FX_FILESIZE offset = 0,
+                         size_t size = 0);
+  void FinishChecksum();
+  void GetChecksum(CFX_ByteString& bsChecksum);
   void Update(const CFX_ByteStringC& bsText);
 
  protected:
   IFX_SAXReader* m_pSAXReader;
   uint8_t* m_pByteContext;
   CFX_ByteString m_bsChecksum;
 };
 
-#endif  // XFA_FXFA_APP_XFA_CHECKSUM_H_
+#endif  // XFA_INCLUDE_FXFA_XFA_CHECKSUM_H_