Issue #2137231 by aspilicious: Remove file_public_path() variable get usage.

core/modules/system/lib/Drupal/system/Tests/System/SettingsRewriteTest.php

@@ -104,7 +104,7 @@ function testDrupalRewriteSettings() {
       ),
     );
     foreach ($tests as $test) {
-      $filename = variable_get('file_public_path', conf_path() . '/files') . '/mock_settings.php';
+      $filename = settings()->get('file_public_path', conf_path() . '/files') . '/mock_settings.php';
       file_put_contents(DRUPAL_ROOT . '/' . $filename, "<?php\n" . $test['original'] . "\n");
       drupal_rewrite_settings($test['settings'], $filename);
       $this->assertEqual(file_get_contents(DRUPAL_ROOT . '/' . $filename), "<?php\n" . $test['expected'] . "\n");