Remove FX_BOOL from fpdfsdk.

fpdfsdk/formfiller/cffl_checkbox.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_FORMFILLER_CFFL_CHECKBOX_H_
 #define FPDFSDK_FORMFILLER_CFFL_CHECKBOX_H_
 
 #include "fpdfsdk/formfiller/cffl_formfiller.h"
 
 class CFFL_CheckBox : public CFFL_Button {
  public:
   CFFL_CheckBox(CPDFSDK_FormFillEnvironment* pApp, CPDFSDK_Widget* pWidget);
   ~CFFL_CheckBox() override;
 
   // CFFL_Button
   CPWL_Wnd* NewPDFWindow(const PWL_CREATEPARAM& cp,
                          CPDFSDK_PageView* pPageView) override;
-  FX_BOOL OnKeyDown(CPDFSDK_Annot* pAnnot,
-                    uint32_t nKeyCode,
-                    uint32_t nFlags) override;
-  FX_BOOL OnChar(CPDFSDK_Annot* pAnnot,
-                 uint32_t nChar,
+  bool OnKeyDown(CPDFSDK_Annot* pAnnot,
+                 uint32_t nKeyCode,
                  uint32_t nFlags) override;
-  FX_BOOL OnLButtonUp(CPDFSDK_PageView* pPageView,
-                      CPDFSDK_Annot* pAnnot,
-                      uint32_t nFlags,
-                      const CFX_FloatPoint& point) override;
-  FX_BOOL IsDataChanged(CPDFSDK_PageView* pPageView) override;
+  bool OnChar(CPDFSDK_Annot* pAnnot, uint32_t nChar, uint32_t nFlags) override;
+  bool OnLButtonUp(CPDFSDK_PageView* pPageView,
+                   CPDFSDK_Annot* pAnnot,
+                   uint32_t nFlags,
+                   const CFX_FloatPoint& point) override;
+  bool IsDataChanged(CPDFSDK_PageView* pPageView) override;
   void SaveData(CPDFSDK_PageView* pPageView) override;
 };
 
 #endif  // FPDFSDK_FORMFILLER_CFFL_CHECKBOX_H_