removing uneeded code and moving the url generation to proper class

lib/Cron/Workers/SendingQueue/SendingQueue.php

@@ -2,6 +2,7 @@
 namespace MailPoet\Cron\Workers\SendingQueue;
 
 use MailPoet\Cron\CronHelper;
+use MailPoet\Cron\Workers\SendingQueue\Tasks\Links;
 use MailPoet\Cron\Workers\SendingQueue\Tasks\Mailer as MailerTask;
 use MailPoet\Cron\Workers\SendingQueue\Tasks\Newsletter as NewsletterTask;
 use MailPoet\Mailer\MailerLog;
@@ -10,7 +11,6 @@ use MailPoet\Models\SendingQueue as SendingQueueModel;
 use MailPoet\Models\Setting;
 use MailPoet\Models\StatisticsNewsletters as StatisticsNewslettersModel;
 use MailPoet\Models\Subscriber as SubscriberModel;
-use MailPoet\Newsletter\Links\Links;
 use MailPoet\Router\Endpoints\Track;
 use MailPoet\Router\Router;
 use MailPoet\Subscription\Url;
@@ -123,7 +123,7 @@ class SendingQueue {
           $prepared_newsletters[0],
           $prepared_subscribers[0],
           $statistics,
-          $this->getExtraParams($queue, $prepared_subscribers_ids)
+          array('unsubscribe_url' => Links::getUnsubscribeUrl($queue, $prepared_subscribers_ids[0]))
         );
         $prepared_newsletters = array();
         $prepared_subscribers = array();
@@ -180,33 +180,6 @@ class SendingQueue {
     MailerLog::enforceExecutionRequirements();
   }
 
-  protected function getExtraParams($queue, $prepared_subscribers_ids) {
-    $subscriber_id = $prepared_subscribers_ids[0];
-    $subscriber = SubscriberModel::where('id', $subscriber_id)->findOne();
-    
-    if((boolean)Setting::getValue('tracking.enabled')) {
-      $link_hash = NewsletterLink::where('queue_id', $queue->id)
-        ->where('url', '[link:subscription_unsubscribe_url]')
-        ->findOne()
-        ->hash;
-      $data = Links::createUrlDataObject(
-        $subscriber_id, 
-        $subscriber->email,
-        $queue->id, 
-        $link_hash, 
-        false
-      );
-      $url = Router::buildRequest(
-        Track::ENDPOINT,
-        Track::ACTION_CLICK,
-        $data
-      );
-    } else {
-      $url = Url::getUnsubscribeUrl($subscriber);
-    }
-    return array('unsubscribe_url' => $url);
-  }
-
   static function getRunningQueues() {
     return SendingQueueModel::orderByAsc('priority')
       ->whereNull('deleted_at')

lib/Cron/Workers/SendingQueue/Tasks/Links.php

@@ -1,8 +1,14 @@
 <?php
 namespace MailPoet\Cron\Workers\SendingQueue\Tasks;
 
-use MailPoet\Newsletter\Links\Links as NewsletterLinks;
 use MailPoet\Util\Helpers;
+use MailPoet\Router\Router;
+use MailPoet\Models\Setting;
+use MailPoet\Subscription\Url;
+use MailPoet\Models\Subscriber;
+use MailPoet\Router\Endpoints\Track;
+use MailPoet\Newsletter\Links\Links as NewsletterLinks;
+use MailPoet\Models\NewsletterLink as NewsletterLinkModel;
 
 if(!defined('ABSPATH')) exit;
 
@@ -30,4 +36,30 @@ class Links {
   static function saveLinks($links, $newsletter, $queue) {
     return NewsletterLinks::save($links, $newsletter->id, $queue->id);
   }
+
+  static function getUnsubscribeUrl($queue, $subscriber_id) {
+    $subscriber = Subscriber::where('id', $subscriber_id)->findOne();
+    
+    if((boolean)Setting::getValue('tracking.enabled')) {
+      $link_hash = NewsletterLinkModel::where('queue_id', $queue->id)
+        ->where('url', '[link:subscription_unsubscribe_url]')
+        ->findOne()
+        ->hash;
+      $data = NewsletterLinks::createUrlDataObject(
+        $subscriber->id, 
+        $subscriber->email,
+        $queue->id, 
+        $link_hash, 
+        false
+      );
+      $url = Router::buildRequest(
+        Track::ENDPOINT,
+        Track::ACTION_CLICK,
+        $data
+      );
+    } else {
+      $url = Url::getUnsubscribeUrl($subscriber);
+    }
+    return $url;
+  }
 }

lib/Subscription/Url.php

@@ -33,9 +33,6 @@ class Url {
       if(is_object($subscriber)) {
         $subscriber = $subscriber->asArray();
       }
-      if(is_string($subscriber)) {
-        $subscriber = array('email' => $subscriber);
-      }
 
       $data = array(
         'token' => Subscriber::generateToken($subscriber['email']),