Remove FX_BOOL entirely.

testing/libfuzzer/pdf_xml_fuzzer.cc

 // Copyright 2016 The 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.
 
 #include <cstddef>
 #include <cstdint>
 #include <limits>
 #include <memory>
 
 #include "core/fxcrt/fx_basic.h"
 #include "core/fxcrt/fx_system.h"
 #include "xfa/fde/xml/fde_xml_imp.h"
 #include "xfa/fxfa/parser/cxfa_xml_parser.h"
 #include "xfa/fxfa/parser/cxfa_widetextread.h"
 
 namespace {
 
 CFDE_XMLNode* XFA_FDEExtension_GetDocumentNode(
     CFDE_XMLDoc* pXMLDoc,
-    FX_BOOL bVerifyWellFormness = FALSE) {
+    bool bVerifyWellFormness = false) {
   if (!pXMLDoc) {
     return nullptr;
   }
   CFDE_XMLNode* pXMLFakeRoot = pXMLDoc->GetRoot();
   for (CFDE_XMLNode* pXMLNode =
            pXMLFakeRoot->GetNodeItem(CFDE_XMLNode::FirstChild);
        pXMLNode; pXMLNode = pXMLNode->GetNodeItem(CFDE_XMLNode::NextSibling)) {
     if (pXMLNode->GetType() == FDE_XMLNODE_Element) {
       if (bVerifyWellFormness) {
         for (CFDE_XMLNode* pNextNode =
@@ skipping 31 matching lines @@
   if (!doc->LoadXML(parser.release()))
     return 0;
 
   int32_t load_result = doc->DoLoad(nullptr);
   if (load_result < 100)
     return 0;
 
   (void)XFA_FDEExtension_GetDocumentNode(doc.get());
   return 0;
 }