Bug 1877940 - Enable remaining ESLint rules on dom/jsurl. r=dom-core,peterv

Differential Revision: https://phabricator.services.mozilla.com/D200279

.eslintrc.js

@@ -443,7 +443,6 @@ module.exports = {
         "dom/events/test/**",
         "dom/file/tests/**",
         "dom/html/test/**",
-        "dom/jsurl/test/**",
         "dom/media/webaudio/test/**",
         "dom/media/webrtc/tests/**",
         "dom/messagechannel/tests/**",

dom/jsurl/test/test_bug351633-3.html

@@ -12,6 +12,8 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=351633
 <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=351633">Mozilla Bug 351633</a>
 <pre id="test">
 <script class="testbody" type="text/javascript">
+// String concatenation used to avoid incorrect detection of end of script elements.
+/* eslint-disable no-useless-concat */
 
 var passJSUrl;
 var passJSUrl2;