Remove FX_BOOL from xfa.

xfa/fxfa/parser/cxfa_dataimporter.h

 // Copyright 2016 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_CXFA_DATAIMPORTER_H_
 #define XFA_FXFA_PARSER_CXFA_DATAIMPORTER_H_
 
 #include "core/fxcrt/fx_system.h"
 
 class CXFA_Document;
 class IFX_SeekableReadStream;
 
 class CXFA_DataImporter {
  public:
   explicit CXFA_DataImporter(CXFA_Document* pDocument);
 
-  FX_BOOL ImportData(IFX_SeekableReadStream* pDataDocument);
+  bool ImportData(IFX_SeekableReadStream* pDataDocument);
 
  protected:
   CXFA_Document* const m_pDocument;
 };
 
 #endif  // XFA_FXFA_PARSER_CXFA_DATAIMPORTER_H_