Remove FX_BOOL from fpdfsdk.

fpdfsdk/pdfwindow/PWL_SpecialButton.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 FPDFSDK_PDFWINDOW_PWL_SPECIALBUTTON_H_
 #define FPDFSDK_PDFWINDOW_PWL_SPECIALBUTTON_H_
 
 #include "fpdfsdk/pdfwindow/PWL_Button.h"
 
 class CPWL_PushButton : public CPWL_Button {
  public:
   CPWL_PushButton();
   ~CPWL_PushButton() override;
 
   // CPWL_Button
   CFX_ByteString GetClassName() const override;
   CFX_FloatRect GetFocusRect() const override;
 };
 
 class CPWL_CheckBox : public CPWL_Button {
  public:
   CPWL_CheckBox();
   ~CPWL_CheckBox() override;
 
   // CPWL_Button
   CFX_ByteString GetClassName() const override;
-  FX_BOOL OnLButtonUp(const CFX_FloatPoint& point, uint32_t nFlag) override;
-  FX_BOOL OnChar(uint16_t nChar, uint32_t nFlag) override;
+  bool OnLButtonUp(const CFX_FloatPoint& point, uint32_t nFlag) override;
+  bool OnChar(uint16_t nChar, uint32_t nFlag) override;
 
   void SetCheck(bool bCheck);
   bool IsChecked() const;
 
  private:
   bool m_bChecked;
 };
 
 class CPWL_RadioButton : public CPWL_Button {
  public:
   CPWL_RadioButton();
   ~CPWL_RadioButton() override;
 
   // CPWL_Button
   CFX_ByteString GetClassName() const override;
-  FX_BOOL OnLButtonUp(const CFX_FloatPoint& point, uint32_t nFlag) override;
-  FX_BOOL OnChar(uint16_t nChar, uint32_t nFlag) override;
+  bool OnLButtonUp(const CFX_FloatPoint& point, uint32_t nFlag) override;
+  bool OnChar(uint16_t nChar, uint32_t nFlag) override;
 
   void SetCheck(bool bCheck);
   bool IsChecked() const;
 
  private:
   bool m_bChecked;
 };
 
 #endif  // FPDFSDK_PDFWINDOW_PWL_SPECIALBUTTON_H_