Remove FX_BOOL from xfa.

xfa/fde/cfde_txtedtbufiter.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_FDE_CFDE_TXTEDTBUFITER_H_
 #define XFA_FDE_CFDE_TXTEDTBUFITER_H_
 
 #include "core/fxcrt/fx_system.h"
 #include "xfa/fde/ifx_chariter.h"
 
 class CFDE_TxtEdtBuf;
 
 class CFDE_TxtEdtBufIter : public IFX_CharIter {
  public:
   CFDE_TxtEdtBufIter(CFDE_TxtEdtBuf* pBuf, FX_WCHAR wcAlias = 0);
   ~CFDE_TxtEdtBufIter() override;
 
-  FX_BOOL Next(FX_BOOL bPrev = FALSE) override;
+  bool Next(bool bPrev = false) override;
   FX_WCHAR GetChar() override;
   void SetAt(int32_t nIndex) override;
   int32_t GetAt() const override;
-  FX_BOOL IsEOF(FX_BOOL bTail = TRUE) const override;
+  bool IsEOF(bool bTail = true) const override;
   IFX_CharIter* Clone() override;
 
  private:
   CFDE_TxtEdtBuf* m_pBuf;
   int32_t m_nCurChunk;
   int32_t m_nCurIndex;
   int32_t m_nIndex;
   FX_WCHAR m_Alias;
 };
 
 #endif  // XFA_FDE_CFDE_TXTEDTBUFITER_H_