Issue 2257 - Replaced non-standard function expressions with ES6 arrow functions

chrome/content/ui/subscriptionSelection.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2015 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 199 matching lines @@
     messageElement.removeAttribute("invisible");
     addMainCheckbox.removeAttribute("invisible");
 
     let [, beforeLink, afterLink] = /(.*)\?1\?(.*)/.exec(messageElement.getAttribute("_textTemplate")) || [null, messageElement.getAttribute("_textTemplate"), ""];
     while (messageElement.firstChild)
       messageElement.removeChild(messageElement.firstChild);
     messageElement.appendChild(document.createTextNode(beforeLink));
     let link = document.createElement("label");
     link.className = "text-link";
     link.setAttribute("tooltiptext", mainSubscriptionURL);
-    link.addEventListener("click", function() UI.loadInBrowser(mainSubscriptionURL), false);
+    link.addEventListener("click", () => UI.loadInBrowser(mainSubscriptionURL), false);
     link.textContent = mainSubscriptionTitle;
     messageElement.appendChild(link);
     messageElement.appendChild(document.createTextNode(afterLink));
 
     addMainCheckbox.value = mainSubscriptionURL;
     addMainCheckbox.setAttribute("_mainSubscriptionTitle", mainSubscriptionTitle)
     let [label, accesskey] = Utils.splitLabel(addMainCheckbox.getAttribute("_labelTemplate"));
     addMainCheckbox.label = label.replace(/\?1\?/g, mainSubscriptionTitle);
     addMainCheckbox.accessKey = accesskey;
   }
@@ skipping 66 matching lines @@
 
   subscription.disabled = false;
   subscription.title = title;
 
   if (subscription instanceof DownloadableSubscription && !subscription.lastDownload)
     Synchronizer.execute(subscription);
 }
 
 function hasSubscription(url)
 {
-  return FilterStorage.subscriptions.some(function(subscription) subscription instanceof DownloadableSubscription && subscription.url == url);
+  return FilterStorage.subscriptions.some(subscription => subscription instanceof DownloadableSubscription && subscription.url == url);
 }