Remove FX_BOOL entirely.

testing/libfuzzer/pdf_xml_fuzzer.cc

Index: testing/libfuzzer/pdf_xml_fuzzer.cc
diff --git a/testing/libfuzzer/pdf_xml_fuzzer.cc b/testing/libfuzzer/pdf_xml_fuzzer.cc
index 37b4a760df4b464a5918faba9bbecdaa5c79a71e..7bd0b66b37be033e3bfed7e16b21e4073cc90d6c 100644
--- a/testing/libfuzzer/pdf_xml_fuzzer.cc
+++ b/testing/libfuzzer/pdf_xml_fuzzer.cc
@@ -17,7 +17,7 @@ namespace {
 
 CFDE_XMLNode* XFA_FDEExtension_GetDocumentNode(
     CFDE_XMLDoc* pXMLDoc,
-    FX_BOOL bVerifyWellFormness = FALSE) {
+    bool bVerifyWellFormness = false) {
   if (!pXMLDoc) {
     return nullptr;
   }