Issue 656 - Replace some __proto__ with Object.create

lib/sync.js

Index: lib/sync.js
===================================================================
--- a/lib/sync.js
+++ b/lib/sync.js
@@ -245,17 +245,17 @@ ABPStore.prototype =
     if (record.id != filtersRecordID)
       return;
 
     this._log.trace("Merging in remote data");
 
     let data = record.cleartext.subscriptions;
 
     // First make sure we have the same subscriptions on both sides
-    let seenSubscription = {__proto__: null};
+    let seenSubscription = Object.create(null);
     for (let remoteSubscription of data)
     {
       seenSubscription[remoteSubscription.url] = true;
       if (remoteSubscription.url in FilterStorage.knownSubscriptions)
       {
         let subscription = FilterStorage.knownSubscriptions[remoteSubscription.url];
         if (!trackerInstance.didSubscriptionChange(remoteSubscription))
         {
@@ -287,17 +287,17 @@ ABPStore.prototype =
       if (!(subscription.url in seenSubscription) && subscription instanceof DownloadableSubscription && !trackerInstance.didSubscriptionChange(subscription))
       {
         // Subscription was removed remotely, remove it locally as well
         FilterStorage.removeSubscription(subscription);
       }
     }
 
     // Now sync the custom filters
-    let seenFilter = {__proto__: null};
+    let seenFilter = Object.create(null);
     for (let remoteSubscription of data)
     {
       if (!("filters" in remoteSubscription))
         continue;
 
       for (let remoteFilter of remoteSubscription.filters)
       {
         seenFilter[remoteFilter.text] = true;