Issue 3862 - Make antiadblockInit use the new FilterNotifier API

lib/antiadblockInit.js

Index: lib/antiadblockInit.js
===================================================================
--- a/lib/antiadblockInit.js
+++ b/lib/antiadblockInit.js
@@ -72,14 +72,19 @@
   if (subscription.lastDownload && subscription.disabled)
     addAntiAdblockNotification(subscription);
 
-  FilterNotifier.addListener(function(action, value, newItem, oldItem)
+  function onSubscriptionChange(subscription)
   {
-    if (!/^subscription\.(updated|removed|disabled)$/.test(action) || value.url != Prefs.subscriptions_antiadblockurl)
+    let url = Prefs.subscriptions_antiadblockurl;
+    if (url != subscription.url)
       return;
 
-    if (action == "subscription.updated")
-      addAntiAdblockNotification(value);
-    else if (action == "subscription.removed" || (action == "subscription.disabled" && !value.disabled))
+    if (url in FilterStorage.knownSubscriptions && !subscription.disabled)
+      addAntiAdblockNotification(subscription);
+    else
       removeAntiAdblockNotification();
-  });
+  }
+
+  FilterNotifier.on("subscription.updated", onSubscriptionChange);
+  FilterNotifier.on("subscription.removed", onSubscriptionChange);
+  FilterNotifier.on("subscription.disabled", onSubscriptionChange);
 }