Bug 1440188 - Fix eslint error from adding intl/l10n to eslint. r=gandalf

MozReview-Commit-ID: 8um44N5dZUv

--HG--
extra : rebase_source : 5d1a01c53a585bca9e396543bf29e3ee3b8565d9

intl/l10n/Localization.jsm

@@ -118,8 +118,6 @@ class L10nError extends Error {
  * be localized into a different language - for example DevTools.
  */
 function defaultGenerateMessages(resourceIds) {
-  const availableLocales = L10nRegistry.getAvailableLocales();
-
   const appLocales = Services.locale.getAppLocalesAsLangTags();
   return L10nRegistry.generateContexts(appLocales, resourceIds);
 }
@@ -253,14 +251,14 @@ class Localization {
    * Register weak observers on events that will trigger cache invalidation
    */
   registerObservers() {
-    Services.obs.addObserver(this, 'intl:app-locales-changed', true);
+    Services.obs.addObserver(this, "intl:app-locales-changed", true);
   }
 
   /**
    * Unregister observers on events that will trigger cache invalidation
    */
   unregisterObservers() {
-    Services.obs.removeObserver(this, 'intl:app-locales-changed');
+    Services.obs.removeObserver(this, "intl:app-locales-changed");
   }
 
   /**