JS: Update ReflectedXssWithCustomSanitizer test

Author: asgerf

javascript/ql/test/query-tests/Security/CWE-079/ReflectedXss/ReflectedXssWithCustomSanitizer.ql

@@ -3,18 +3,17 @@
 //
 import javascript
 import semmle.javascript.security.dataflow.ReflectedXssQuery
+private import semmle.javascript.security.dataflow.Xss::Shared as SharedXss
 
-class IsVarNameSanitizer extends TaintTracking::AdditionalSanitizerGuardNode, DataFlow::CallNode {
+class IsVarNameSanitizer extends SharedXss::BarrierGuard, DataFlow::CallNode {
   IsVarNameSanitizer() { this.getCalleeName() = "isVarName" }
 
-  override predicate sanitizes(boolean outcome, Expr e) {
+  override predicate blocksExpr(boolean outcome, Expr e) {
     outcome = true and
     e = this.getArgument(0).asExpr()
   }
-
-  override predicate appliesTo(TaintTracking::Configuration cfg) { cfg instanceof Configuration }
 }
 
-from Configuration xss, Source source, Sink sink
-where xss.hasFlow(source, sink)
+from Source source, Sink sink
+where ReflectedXssFlow::flow(source, sink)
 select sink, "Cross-site scripting vulnerability due to $@.", source, "user-provided value"