Remove FX_BOOL from xfa.

xfa/fxfa/parser/cxfa_submit.cpp

 // 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
 
 #include "xfa/fxfa/parser/cxfa_submit.h"
 
 #include "xfa/fxfa/parser/xfa_object.h"
 
 CXFA_Submit::CXFA_Submit(CXFA_Node* pNode) : CXFA_Data(pNode) {}
 
-FX_BOOL CXFA_Submit::IsSubmitEmbedPDF() {
+bool CXFA_Submit::IsSubmitEmbedPDF() {
   return m_pNode->GetBoolean(XFA_ATTRIBUTE_EmbedPDF);
 }
 
 int32_t CXFA_Submit::GetSubmitFormat() {
   return m_pNode->GetEnum(XFA_ATTRIBUTE_Format);
 }
 
 void CXFA_Submit::GetSubmitTarget(CFX_WideStringC& wsTarget) {
   m_pNode->TryCData(XFA_ATTRIBUTE_Target, wsTarget);
 }
 
 void CXFA_Submit::GetSubmitXDPContent(CFX_WideStringC& wsContent) {
   m_pNode->TryCData(XFA_ATTRIBUTE_XdpContent, wsContent);
 }