Issue #3164626 - Update code

Closes #3164626

modules/oembedembedly/plugins/providers/embedly.inc

@@ -58,7 +58,7 @@ function oembedembedly_provider_get_child($plugin, $parent, $child) {
  *
  */
 function oembedembedly_provider_callback($plugin, $url, $matches, $parameters) {
-  $parameters['key'] = variable_get('oembedembedly_api_key', NULL);
+  $parameters['key'] = \Drupal::state()->get('oembedembedly_api_key', NULL);
 
   // This guarantees that the plugin's file is loaded.
   $function = ctools_plugin_load_function('oembed', 'providers', 'default', 'callback');