#9236: remove the usage of the json data helper

 - replace the json data help in the AdminNotification Messages block

Author: dmanners

app/code/Magento/AdminNotification/Block/System/Messages.php

@@ -16,24 +16,34 @@ class Messages extends \Magento\Backend\Block\Template
 
     /**
      * @var \Magento\Framework\Json\Helper\Data
+     * @deprecated
      */
     protected $jsonHelper;
 
+    /**
+     * @var \Magento\Framework\Serialize\Serializer\Json
+     */
+    private $serializer;
+
     /**
      * @param \Magento\Backend\Block\Template\Context $context
      * @param \Magento\AdminNotification\Model\ResourceModel\System\Message\Collection\Synchronized $messages
      * @param \Magento\Framework\Json\Helper\Data $jsonHelper
      * @param array $data
+     * @param \Magento\Framework\Serialize\Serializer\Json|null $serializer
      */
     public function __construct(
         \Magento\Backend\Block\Template\Context $context,
         \Magento\AdminNotification\Model\ResourceModel\System\Message\Collection\Synchronized $messages,
         \Magento\Framework\Json\Helper\Data $jsonHelper,
-        array $data = []
+        array $data = [],
+        \Magento\Framework\Serialize\Serializer\Json $serializer = null
     ) {
         $this->jsonHelper = $jsonHelper;
         parent::__construct($context, $data);
         $this->_messages = $messages;
+        $this->serializer = $serializer ?: \Magento\Framework\App\ObjectManager::getInstance()
+            ->get(\Magento\Framework\Serialize\Serializer\Json::class);
     }
 
     /**
@@ -117,7 +127,7 @@ protected function _getMessagesUrl()
      */
     public function getSystemMessageDialogJson()
     {
-        return $this->jsonHelper->jsonEncode(
+        return $this->serializer->serialize(
             [
                 'systemMessageDialog' => [
                     'buttons' => [],