diff --git a/core/includes/bootstrap.inc b/core/includes/bootstrap.inc
index cf0e3dd..f225bff 100644
--- a/core/includes/bootstrap.inc
+++ b/core/includes/bootstrap.inc
@@ -1007,22 +1007,6 @@ function drupal_page_is_cacheable($allow_caching = NULL) {
 }
 
 /**
- * Invokes a bootstrap hook in all bootstrap modules that implement it.
- *
- * @param $hook
- *   The name of the bootstrap hook to invoke.
- *
- * @see bootstrap_hooks()
- */
-function bootstrap_invoke_all($hook) {
-  $module_handler = Drupal::moduleHandler();
-  foreach ($module_handler->getBootstrapModules() as $module) {
-    $module_handler->load($module);
-    module_invoke($module, $hook);
-  }
-}
-
-/**
  * Includes a file with the provided type and name.
  *
  * This prevents including a theme, engine, module, etc., more than once.
@@ -1325,13 +1309,6 @@ function drupal_serve_page_from_cache(stdClass $cache, Response $response, Reque
 }
 
 /**
- * Defines the critical hooks that force modules to always be loaded.
- */
-function bootstrap_hooks() {
-  return array('watchdog');
-}
-
-/**
  * Translates a string to the current language or to a given language.
  *
  * The t() function serves two purposes. First, at run-time it translates
@@ -2134,9 +2111,6 @@ function _drupal_bootstrap_variables() {
 
   // Load variables from the database, but do not overwrite variables set in settings.php.
   $conf = variable_initialize(isset($conf) ? $conf : array());
-  // Load bootstrap modules.
-  require_once __DIR__ . '/module.inc';
-  Drupal::moduleHandler()->loadBootstrapModules();
 }
 
 /**
diff --git a/core/includes/common.inc b/core/includes/common.inc
index 61b63be..13f06b0 100644
--- a/core/includes/common.inc
+++ b/core/includes/common.inc
@@ -3971,6 +3971,7 @@ function drupal_valid_token($token, $value = '', $skip_anonymous = FALSE) {
  */
 function _drupal_bootstrap_code() {
   require_once __DIR__ . '/../../' . settings()->get('path_inc', 'core/includes/path.inc');
+  require_once __DIR__ . '/module.inc';
   require_once __DIR__ . '/theme.inc';
   require_once __DIR__ . '/pager.inc';
   require_once __DIR__ . '/../../' . settings()->get('menu_inc', 'core/includes/menu.inc');
@@ -5543,11 +5544,6 @@ function drupal_flush_all_caches() {
   // actually loaded.
   $module_handler->loadAll();
 
-  // Update the list of bootstrap modules.
-  // Allows developers to get new bootstrap hooks implementations registered
-  // without having to write a hook_update_N() function.
-  _system_update_bootstrap_status();
-
   // Rebuild the schema and cache a fully-built schema based on new module data.
   // This is necessary for any invocation of index.php, because setting cache
   // table entries requires schema information and that occurs during bootstrap
diff --git a/core/includes/update.inc b/core/includes/update.inc
index 3659caf..67d0a44 100644
--- a/core/includes/update.inc
+++ b/core/includes/update.inc
@@ -144,6 +144,10 @@ function update_prepare_d8_bootstrap() {
   // Bootstrap the database.
   drupal_bootstrap(DRUPAL_BOOTSTRAP_DATABASE);
 
+  // module.inc is not yet loaded but there are calls to module_config_sort()
+  // below.
+  require_once __DIR__ . '/module.inc';
+
   // If the site has not updated to Drupal 8 yet, check to make sure that it is
   // running an up-to-date version of Drupal 7 before proceeding. Note this has
   // to happen AFTER the database bootstraps because of
diff --git a/core/lib/Drupal/Core/Extension/CachedModuleHandler.php b/core/lib/Drupal/Core/Extension/CachedModuleHandler.php
index 0e98472..32faa77 100644
--- a/core/lib/Drupal/Core/Extension/CachedModuleHandler.php
+++ b/core/lib/Drupal/Core/Extension/CachedModuleHandler.php
@@ -46,24 +46,6 @@ public function __construct(array $module_list = array(), KeyValueStoreInterface
   }
 
   /**
-   * Implements \Drupal\Core\Extension\ModuleHandlerInterface::getBootstrapModules().
-   */
-  public function getBootstrapModules() {
-    if (isset($this->bootstrapModules)) {
-      return $this->bootstrapModules;
-    }
-    if ($cached = $this->bootstrapCache->get('bootstrap_modules')) {
-      $bootstrap_list = $cached->data;
-    }
-    else {
-      $bootstrap_list = $this->state->get('system.module.bootstrap') ?: array();
-      $this->bootstrapCache->set('bootstrap_modules', $bootstrap_list);
-    }
-    $this->bootstrapModules = array_keys($bootstrap_list);
-    return $this->bootstrapModules;
-  }
-
-  /**
    * Overrides \Drupal\Core\Extension\ModuleHandler::getHookInfo().
    */
   public function getHookInfo() {
diff --git a/core/lib/Drupal/Core/Extension/ModuleHandler.php b/core/lib/Drupal/Core/Extension/ModuleHandler.php
index 656e918..fe228f4 100644
--- a/core/lib/Drupal/Core/Extension/ModuleHandler.php
+++ b/core/lib/Drupal/Core/Extension/ModuleHandler.php
@@ -29,13 +29,6 @@ class ModuleHandler implements ModuleHandlerInterface {
   protected $loadedFiles;
 
   /**
-   * List of enabled bootstrap modules.
-   *
-   * @var array
-   */
-  protected $bootstrapModules;
-
-  /**
    * List of enabled modules.
    *
    * @var array
@@ -125,17 +118,6 @@ public function reload() {
   }
 
   /**
-   * Implements \Drupal\Core\Extension\ModuleHandlerInterface::loadBootstrapModules().
-   */
-  public function loadBootstrapModules() {
-    if (!$this->loaded) {
-      foreach ($this->getBootstrapModules() as $module) {
-        $this->load($module);
-      }
-    }
-  }
-
-  /**
    * Implements \Drupal\Core\Extension\ModuleHandlerInterface::isLoaded().
    */
   public function isLoaded() {
@@ -160,15 +142,6 @@ public function setModuleList(array $module_list = array()) {
   }
 
   /**
-   * Implements \Drupal\Core\Extension\ModuleHandlerInterface::getBootstrapModules().
-   */
-  public function getBootstrapModules() {
-    // The basic module handler does not know anything about how to retrieve a
-    // list of bootstrap modules.
-    return array();
-  }
-
-  /**
    * Implements \Drupal\Core\Extension\ModuleHandlerInterface::buildModuleDependencies().
    */
   public function buildModuleDependencies(array $modules) {
@@ -649,10 +622,6 @@ public function enable($module_list, $enable_dependencies = TRUE) {
           $kernel->updateModules($module_filenames, $module_filenames);
         }
 
-        // Refresh the list of modules that implement bootstrap hooks.
-        // @see bootstrap_hooks()
-        _system_update_bootstrap_status();
-
         // Refresh the schema to include it.
         drupal_get_schema(NULL, TRUE);
         // Update the theme registry to include it.
@@ -796,7 +765,6 @@ function disable($module_list, $disable_dependents = TRUE) {
       // Invoke hook_modules_disabled before disabling modules,
       // so we can still call module hooks to get information.
       $this->invokeAll('modules_disabled', array($invoke_modules));
-      _system_update_bootstrap_status();
 
       // Update the kernel to exclude the disabled modules.
       $enabled = $this->getModuleList();
diff --git a/core/lib/Drupal/Core/Extension/ModuleHandlerInterface.php b/core/lib/Drupal/Core/Extension/ModuleHandlerInterface.php
index 44284b9..5486eec 100644
--- a/core/lib/Drupal/Core/Extension/ModuleHandlerInterface.php
+++ b/core/lib/Drupal/Core/Extension/ModuleHandlerInterface.php
@@ -35,11 +35,6 @@ public function load($name);
   public function loadAll();
 
   /**
-   * Loads all enabled bootstrap modules.
-   */
-  public function loadBootstrapModules();
-
-  /**
    * Returns whether all modules have been loaded.
    *
    * @return bool
@@ -72,11 +67,6 @@ public function getModuleList();
   public function setModuleList(array $module_list = array());
 
   /**
-   * Retrieves the list of bootstrap modules.
-   */
-  public function getBootstrapModules();
-
-  /**
    * Determines which modules require and are required by each module.
    *
    * @param array $modules
diff --git a/core/modules/system/system.module b/core/modules/system/system.module
index ae4131d..7b93174 100644
--- a/core/modules/system/system.module
+++ b/core/modules/system/system.module
@@ -2833,7 +2833,6 @@ function _system_rebuild_module_data() {
     'version' => NULL,
     'php' => DRUPAL_MINIMUM_PHP,
     'files' => array(),
-    'bootstrap' => 0,
   );
 
   // Read info files for each module.
@@ -2920,23 +2919,6 @@ function system_rebuild_module_data() {
 }
 
 /**
- * Refreshes the list of bootstrap modules.
- *
- * This is called internally by module_enable/disable() to flag modules that
- * implement hooks used during bootstrap, such as hook_watchdog(). These modules
- * are loaded earlier to invoke the hooks.
- */
-function _system_update_bootstrap_status() {
-  $bootstrap_modules = array();
-  foreach (bootstrap_hooks() as $hook) {
-    foreach (module_implements($hook) as $module) {
-      $bootstrap_modules[$module] = drupal_get_filename('module', $module);
-    }
-  }
-  Drupal::state()->set('system.module.bootstrap', $bootstrap_modules);
-}
-
-/**
  * Helper function to scan and collect theme .info.yml data and their engines.
  *
  * @return