Remove FX_BOOL from xfa.

xfa/fwl/theme/cfwl_arrowdata.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_FWL_THEME_CFWL_ARROWDATA_H_
 #define XFA_FWL_THEME_CFWL_ARROWDATA_H_
 
 #include <memory>
 
 #include "core/fxcrt/fx_system.h"
 #include "core/fxge/fx_dib.h"
 
 class CFWL_ArrowData {
  public:
   struct CColorData {
     FX_ARGB clrBorder[4];
     FX_ARGB clrStart[4];
     FX_ARGB clrEnd[4];
     FX_ARGB clrSign[4];
   };
 
   static CFWL_ArrowData* GetInstance();
-  static FX_BOOL HasInstance();
+  static bool HasInstance();
   static void DestroyInstance();
   void SetColorData(uint32_t dwID);
 
   std::unique_ptr<CColorData> m_pColorData;
 
  private:
   CFWL_ArrowData();
   ~CFWL_ArrowData();
 };
 
 #endif  // XFA_FWL_THEME_CFWL_ARROWDATA_H_