Remove IXFA_* interfaces.

xfa/fxfa/app/xfa_ffdochandler.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_FFDOCHANDLER_H_
-#define XFA_FXFA_APP_XFA_FFDOCHANDLER_H_
-
-#include "xfa/include/fxfa/fxfa.h"
-
-class CXFA_FFDocHandler : public IXFA_DocHandler {
- public:
-  CXFA_FFDocHandler();
-  ~CXFA_FFDocHandler();
-
-  void ReleaseDoc(IXFA_Doc* hDoc) override;
-  IXFA_DocProvider* GetDocProvider(IXFA_Doc* hDoc) override;
-  uint32_t GetDocType(IXFA_Doc* hDoc) override;
-  int32_t StartLoad(IXFA_Doc* hDoc) override;
-  int32_t DoLoad(IXFA_Doc* hDoc, IFX_Pause* pPause = NULL) override;
-  void StopLoad(IXFA_Doc* hDoc) override;
-
-  IXFA_DocView* CreateDocView(IXFA_Doc* hDoc, uint32_t dwView = 0) override;
-  int32_t CountPackages(IXFA_Doc* hDoc) override;
-  void GetPackageName(IXFA_Doc* hDoc,
-                      int32_t iPackage,
-                      CFX_WideStringC& wsPackage) override;
-  CFDE_XMLElement* GetPackageData(IXFA_Doc* hDoc,
-                                  const CFX_WideStringC& wsPackage);
-  FX_BOOL SavePackage(IXFA_Doc* hDoc,
-                      const CFX_WideStringC& wsPackage,
-                      IFX_FileWrite* pFile,
-                      IXFA_ChecksumContext* pCSContext = NULL) override;
-  FX_BOOL CloseDoc(IXFA_Doc* hDoc) override;
-  FX_BOOL ImportData(IXFA_Doc* hDoc,
-                     IFX_FileRead* pStream,
-                     FX_BOOL bXDP = TRUE) override;
-  void SetJSERuntime(IXFA_Doc* hDoc, FXJSE_HRUNTIME hRuntime) override;
-  FXJSE_HVALUE GetXFAScriptObject(IXFA_Doc* hDoc) override;
-  XFA_ATTRIBUTEENUM GetRestoreState(IXFA_Doc* hDoc) override;
-  FX_BOOL RunDocScript(IXFA_Doc* hDoc,
-                       XFA_SCRIPTTYPE eScriptType,
-                       const CFX_WideStringC& wsScript,
-                       FXJSE_HVALUE hRetValue,
-                       FXJSE_HVALUE hThisObject) override;
-
- protected:
-};
-
-#endif  // XFA_FXFA_APP_XFA_FFDOCHANDLER_H_