Issue 427 - Remove non-standard function and getter syntax

lib/sync.js

 /*
  * This file is part of Adblock Plus <http://adblockplus.org/>,
  * Copyright (C) 2006-2014 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 288 matching lines @@
         continue;
 
       for (let remoteFilter of remoteSubscription.filters)
       {
         seenFilter[remoteFilter.text] = true;
 
         let filter = Filter.fromText(remoteFilter.text);
         if (trackerInstance.didFilterChange(filter))
           continue;
 
-        if (filter.subscriptions.some(function(subscription) { return (subscription instanceof SpecialSubscription); }))
+        if (filter.subscriptions.some((subscription) => subscription instanceof SpecialSubscription))
         {
           // Filter might have been changed remotely
           if (filter instanceof ActiveFilter)
             filter.disabled = remoteFilter.disabled;
         }
         else
         {
           // Filter was added remotely, add it locally as well
           FilterStorage.addFilter(filter);
         }
@@ skipping 130 matching lines @@
       case "filter.added":
       case "filter.removed":
       case "filter.disabled":
         this.addPrivateChange("filter " + item.text);
         break;
     }
   }
 };
 
 SyncServiceObserver.init();