Issue #2159911 by InternetDevels, ParisLiakos: drupal_load() is called pointlessly.

core/modules/forum/forum.install

@@ -104,16 +104,10 @@ function forum_module_preinstall($module) {
  * Implements hook_uninstall().
  */
 function forum_uninstall() {
-  // Load the dependent Taxonomy module, in case it has been disabled.
-  drupal_load('module', 'taxonomy');
-
   if ($field = field_info_field('node', 'taxonomy_forums')) {
     $field->delete();
   }
 
-  // Load the dependent Comment module, in case it has been disabled.
-  drupal_load('module', 'comment');
-
   if ($field = field_info_field('node', 'comment_forum')) {
     $field->delete();
   }

core/modules/simpletest/simpletest.install

@@ -157,7 +157,6 @@ function simpletest_schema() {
  * Implements hook_uninstall().
  */
 function simpletest_uninstall() {
-  drupal_load('module', 'simpletest');
   simpletest_clean_database();
 
   // Remove generated files.

core/modules/system/lib/Drupal/system/Tests/File/ScanDirectoryTest.php

@@ -61,7 +61,6 @@ class ScanDirectoryTest extends FileTestBase {
    * Check that the callback function is called correctly.
    */
   function testOptionCallback() {
-    drupal_load('module', 'file_test');
 
     // When nothing is matched nothing should be passed to the callback.
     $all_files = file_scan_directory($this->path, '/^NONEXISTINGFILENAME/', array('callback' => 'file_test_file_scan_callback'));