Remove IXFA_* interfaces.

xfa/fxfa/parser/xfa_docdata.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_PARSER_XFA_DOCDATA_H_
 #define XFA_FXFA_PARSER_XFA_DOCDATA_H_
 
 #include "xfa/fxfa/parser/xfa_document.h"
 
 enum XFA_DATAFORMAT {
   XFA_DATAFORMAT_XDP,
 };
 
-class IXFA_PacketExport {
- public:
-  static IXFA_PacketExport* Create(CXFA_Document* pDocument,
-                                   XFA_DATAFORMAT eFormat = XFA_DATAFORMAT_XDP);
-  virtual ~IXFA_PacketExport() {}
-  virtual void Release() = 0;
-  virtual FX_BOOL Export(IFX_FileWrite* pWrite) = 0;
-  virtual FX_BOOL Export(IFX_FileWrite* pWrite,
-                         CXFA_Node* pNode,
-                         uint32_t dwFlag = 0,
-                         const FX_CHAR* pChecksum = NULL) = 0;
-};
-class IXFA_PacketImport {
- public:
-  static IXFA_PacketImport* Create(CXFA_Document* pDstDoc);
-  virtual ~IXFA_PacketImport() {}
-  virtual void Release() = 0;
-  virtual FX_BOOL ImportData(IFX_FileRead* pDataDocument) = 0;
-};
-
 #endif  // XFA_FXFA_PARSER_XFA_DOCDATA_H_