Fix some FX_BOOL / int noise in fxcrt.

core/fxcrt/fxcrt_posix.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 CORE_FXCRT_FXCRT_POSIX_H_
 #define CORE_FXCRT_FXCRT_POSIX_H_
 
 #include "core/fxcrt/extension.h"
 
 #if _FXM_PLATFORM_ == _FXM_PLATFORM_LINUX_ || \
     _FXM_PLATFORM_ == _FXM_PLATFORM_APPLE_ || \
     _FXM_PLATFORM_ == _FXM_PLATFORM_ANDROID_
 class CFXCRT_FileAccess_Posix : public IFXCRT_FileAccess {
  public:
   CFXCRT_FileAccess_Posix();
   ~CFXCRT_FileAccess_Posix() override;
 
-  // IFXCRT_FileAccess
-  FX_BOOL Open(const CFX_ByteStringC& fileName, uint32_t dwMode) override;
-  FX_BOOL Open(const CFX_WideStringC& fileName, uint32_t dwMode) override;
+  // IFXCRT_FileAccess:
+  bool Open(const CFX_ByteStringC& fileName, uint32_t dwMode) override;
+  bool Open(const CFX_WideStringC& fileName, uint32_t dwMode) override;
   void Close() override;
   FX_FILESIZE GetSize() const override;
   FX_FILESIZE GetPosition() const override;
   FX_FILESIZE SetPosition(FX_FILESIZE pos) override;
   size_t Read(void* pBuffer, size_t szBuffer) override;
   size_t Write(const void* pBuffer, size_t szBuffer) override;
   size_t ReadPos(void* pBuffer, size_t szBuffer, FX_FILESIZE pos) override;
   size_t WritePos(const void* pBuffer,
                   size_t szBuffer,
                   FX_FILESIZE pos) override;
-  FX_BOOL Flush() override;
-  FX_BOOL Truncate(FX_FILESIZE szFile) override;
+  bool Flush() override;
+  bool Truncate(FX_FILESIZE szFile) override;
 
  protected:
   int32_t m_nFD;
 };
 #endif
 
 #endif  // CORE_FXCRT_FXCRT_POSIX_H_