remove unused import

Author: erik-krogh

javascript/ql/lib/semmle/javascript/security/dataflow/ClientSideUrlRedirectCustomizations.qll

@@ -8,8 +8,6 @@ import javascript
 import semmle.javascript.security.dataflow.RemoteFlowSources
 
 module ClientSideUrlRedirect {
-  private import Xss::DomBasedXss as DomBasedXss
-
   /**
    * A data flow source for unvalidated URL redirect vulnerabilities.
    */