Remove FX_BOOL from fpdfsdk.

fpdfsdk/formfiller/cffl_pushbutton.cpp

 // 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
 
 #include "fpdfsdk/formfiller/cffl_pushbutton.h"
 
 #include "fpdfsdk/formfiller/cffl_formfiller.h"
 #include "fpdfsdk/pdfwindow/PWL_SpecialButton.h"
 
 CFFL_PushButton::CFFL_PushButton(CPDFSDK_FormFillEnvironment* pApp,
                                  CPDFSDK_Annot* pAnnot)
     : CFFL_Button(pApp, pAnnot) {}
 
 CFFL_PushButton::~CFFL_PushButton() {}
 
 CPWL_Wnd* CFFL_PushButton::NewPDFWindow(const PWL_CREATEPARAM& cp,
                                         CPDFSDK_PageView* pPageView) {
   CPWL_PushButton* pWnd = new CPWL_PushButton();
   pWnd->Create(cp);
 
   return pWnd;
 }
 
-FX_BOOL CFFL_PushButton::OnChar(CPDFSDK_Annot* pAnnot,
-                                uint32_t nChar,
-                                uint32_t nFlags) {
+bool CFFL_PushButton::OnChar(CPDFSDK_Annot* pAnnot,
+                             uint32_t nChar,
+                             uint32_t nFlags) {
   return CFFL_FormFiller::OnChar(pAnnot, nChar, nFlags);
 }
 
 void CFFL_PushButton::OnDraw(CPDFSDK_PageView* pPageView,
                              CPDFSDK_Annot* pAnnot,
                              CFX_RenderDevice* pDevice,
                              CFX_Matrix* pUser2Device) {
   CFFL_Button::OnDraw(pPageView, pAnnot, pDevice, pUser2Device);
 }