updateManager.diff

diff --git a/core/modules/update/src/UpdateManager.php b/core/modules/update/src/UpdateManager.php
index 21cfe80..833b8e5 100644
--- a/core/modules/update/src/UpdateManager.php
+++ b/core/modules/update/src/UpdateManager.php
@@ -13,6 +13,7 @@
 use Drupal\Core\StringTranslation\TranslationInterface;
 use Drupal\Core\StringTranslation\StringTranslationTrait;
 use Drupal\Core\Utility\ProjectInfo;
+use Drupal\Core\Extension\ThemeHandler;
 
 /**
  * Default implementation of UpdateManagerInterface.
@@ -64,6 +65,13 @@ class UpdateManager implements UpdateManagerInterface {
   protected $availableReleasesTempStore;
 
   /**
+   * Theme handler.
+   *
+   * @var \Drupal\Core\Extension\ThemeHandler
+   */
+  protected $themeHandler;
+
+  /**
    * Constructs a UpdateManager.
    *
    * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
@@ -77,13 +85,14 @@ class UpdateManager implements UpdateManagerInterface {
    * @param \Drupal\Core\KeyValueStore\KeyValueFactoryInterface $key_value_expirable_factory
    *   The expirable key/value factory.
    */
-  public function __construct(ConfigFactoryInterface $config_factory, ModuleHandlerInterface $module_handler, UpdateProcessorInterface $update_processor, TranslationInterface $translation, KeyValueFactoryInterface $key_value_expirable_factory) {
+  public function __construct(ConfigFactoryInterface $config_factory, ModuleHandlerInterface $module_handler, UpdateProcessorInterface $update_processor, TranslationInterface $translation, KeyValueFactoryInterface $key_value_expirable_factory, ThemeHandler $theme_handler) {
     $this->updateSettings = $config_factory->get('update.settings');
     $this->moduleHandler = $module_handler;
     $this->updateProcessor = $update_processor;
     $this->stringTranslation = $translation;
     $this->keyValueStore = $key_value_expirable_factory->get('update');
     $this->availableReleasesTempStore = $key_value_expirable_factory->get('update_available_releases');
+    $this->themeHandler = $theme_handler;
     $this->projects = array();
   }
 
@@ -123,7 +132,7 @@ public function getProjects() {
       if (empty($this->projects)) {
         // Still empty, so we have to rebuild.
         $module_data = system_rebuild_module_data();
-        $theme_data = system_rebuild_theme_data();
+        $theme_data = $this->themeHandler->rebuildThemeData();
         $project_info = new ProjectInfo();
         $project_info->processInfoList($this->projects, $module_data, 'module', TRUE);
         $project_info->processInfoList($this->projects, $theme_data, 'theme', TRUE);
diff --git a/core/modules/update/update.services.yml b/core/modules/update/update.services.yml
index fe01f47..3564412 100644
--- a/core/modules/update/update.services.yml
+++ b/core/modules/update/update.services.yml
@@ -6,7 +6,7 @@ services:
       - { name: access_check, applies_to: _access_update_manager }
   update.manager:
     class: Drupal\update\UpdateManager
-    arguments: ['@config.factory', '@module_handler', '@update.processor', '@string_translation', '@keyvalue.expirable']
+    arguments: ['@config.factory', '@module_handler', '@update.processor', '@string_translation', '@keyvalue.expirable', '@module_handler']
   update.processor:
     class: Drupal\update\UpdateProcessor
     arguments: ['@config.factory', '@queue', '@update.fetcher', '@state', '@private_key', '@keyvalue', '@keyvalue.expirable']