diff --git a/core/modules/config/config.admin.inc b/core/modules/config/config.admin.inc
index e81c582..9d6a605 100644
--- a/core/modules/config/config.admin.inc
+++ b/core/modules/config/config.admin.inc
@@ -10,136 +10,6 @@
 use Drupal\Core\Ajax\OpenModalDialogCommand;
 
 /**
- * Helper function to construct the storage changes in a configuration synchronization form.
- *
- * @param array $form
- *   The form structure to add to. Passed by reference.
- * @param array $form_state
- *   The current state of the form. Passed by reference.
- * @param Drupal\Core\Config\StorageInterface $source_storage
- *   The source storage to retrieve differences from.
- * @param Drupal\Core\Config\StorageInterface $target_storage
- *   The target storage to compare differences to.
- */
-function config_admin_sync_form(array &$form, array &$form_state, StorageInterface $source_storage, StorageInterface $target_storage) {
-  $source_list = $source_storage->listAll();
-  if (empty($source_list)) {
-    $form['no_changes'] = array(
-      '#markup' => t('There is no configuration to import.'),
-    );
-    $form['actions']['#access'] = FALSE;
-    return $form;
-  }
-
-  $config_changes = config_sync_get_changes($source_storage, $target_storage);
-  if (empty($config_changes)) {
-    $form['no_changes'] = array(
-      '#markup' => t('There are no configuration changes.'),
-    );
-    return $form;
-  }
-
-  // Add the AJAX library to the form for dialog support.
-  $form['#attached']['library'][] = array('system', 'drupal.ajax');
-
-  foreach ($config_changes as $config_change_type => $config_files) {
-    if (empty($config_files)) {
-      continue;
-    }
-
-    // @todo A table caption would be more appropriate, but does not have the
-    //   visual importance of a heading.
-    $form[$config_change_type]['heading'] = array(
-      '#theme' => 'html_tag__h3',
-      '#tag' => 'h3',
-    );
-    switch ($config_change_type) {
-      case 'create':
-        $form[$config_change_type]['heading']['#value'] = format_plural(count($config_files), '@count new', '@count new');
-        break;
-
-      case 'change':
-        $form[$config_change_type]['heading']['#value'] = format_plural(count($config_files), '@count changed', '@count changed');
-        break;
-
-      case 'delete':
-        $form[$config_change_type]['heading']['#value'] = format_plural(count($config_files), '@count removed', '@count removed');
-        break;
-    }
-    $form[$config_change_type]['list'] = array(
-      '#theme' => 'table',
-      '#header' => array('Name', 'Operations'),
-    );
-
-    foreach ($config_files as $config_file) {
-      $links['view_diff'] = array(
-        'title' => t('View differences'),
-        'href' => 'admin/config/development/sync/diff/' . $config_file,
-        'attributes' => array(
-          'class' => array('use-ajax'),
-        ),
-      );
-      $form[$config_change_type]['list']['#rows'][] = array(
-        'name' => $config_file,
-        'operations' => array(
-          'data' => array(
-            '#type' => 'operations',
-            '#links' => $links,
-          ),
-        ),
-      );
-    }
-  }
-}
-
-/**
- * Form constructor for configuration import form.
- *
- * @see config_admin_import_form_submit()
- * @see config_import()
- */
-function config_admin_import_form($form, &$form_state) {
-  // Retrieve a list of differences between last known state and active store.
-  $source_storage = drupal_container()->get('config.storage.staging');
-  $target_storage = drupal_container()->get('config.storage');
-
-  $form['actions'] = array('#type' => 'actions');
-  $form['actions']['submit'] = array(
-    '#type' => 'submit',
-    '#value' => t('Import all'),
-  );
-
-  config_admin_sync_form($form, $form_state, $source_storage, $target_storage);
-
-  return $form;
-}
-
-/**
- * Form submission handler for config_admin_import_form().
- */
-function config_admin_import_form_submit($form, &$form_state) {
-  if (!lock()->lockMayBeAvailable(CONFIG_IMPORT_LOCK)) {
-    drupal_set_message(t('Another request may be synchronizing configuration already.'));
-  }
-  else if (config_import()) {
-    // Once a sync completes, we empty the staging directory. This prevents
-    // changes from being accidentally overwritten by stray files getting
-    // imported later.
-    $source_storage = drupal_container()->get('config.storage.staging');
-    foreach ($source_storage->listAll() as $name) {
-      $source_storage->delete($name);
-    }
-
-    drupal_flush_all_caches();
-
-    drupal_set_message(t('The configuration was imported successfully.'));
-  }
-  else {
-    drupal_set_message(t('The import failed due to an error. Any errors have been logged.'), 'error');
-  }
-}
-
-/**
  * Page callback: Shows diff of specificed configuration file.
  *
  * @param string $config_file
diff --git a/core/modules/config/config.module b/core/modules/config/config.module
index e3b6027..c7dd2c4 100644
--- a/core/modules/config/config.module
+++ b/core/modules/config/config.module
@@ -43,10 +43,7 @@ function config_menu() {
   $items['admin/config/development/sync'] = array(
     'title' => 'Synchronize configuration',
     'description' => 'Synchronize configuration changes.',
-    'page callback' => 'drupal_get_form',
-    'page arguments' => array('config_admin_import_form'),
-    'access arguments' => array('synchronize configuration'),
-    'file' => 'config.admin.inc',
+    'route_name' => 'config_admin_import',
   );
   $items['admin/config/development/sync/diff/%'] = array(
     'title' => 'Configuration file diff',
diff --git a/core/modules/config/config.routing.yml b/core/modules/config/config.routing.yml
new file mode 100644
index 0000000..f76dd07
--- /dev/null
+++ b/core/modules/config/config.routing.yml
@@ -0,0 +1,6 @@
+config_admin_import:
+  pattern: '/admin/config/development/sync'
+  defaults:
+    _form: '\Drupal\config\Form\ConfigAdminImportForm'
+  requirements:
+    _permission: 'synchronize configuration'
diff --git a/core/modules/config/lib/Drupal/config/Form/ConfigAdminImportForm.php b/core/modules/config/lib/Drupal/config/Form/ConfigAdminImportForm.php
new file mode 100644
index 0000000..3c36e1e
--- /dev/null
+++ b/core/modules/config/lib/Drupal/config/Form/ConfigAdminImportForm.php
@@ -0,0 +1,188 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\config\Form\ConfigAdminImportForm.
+ */
+
+namespace Drupal\config\Form;
+
+use Drupal\Core\ControllerInterface;
+use Drupal\Core\Form\FormInterface;
+use Drupal\Core\Config\StorageInterface;
+use Drupal\Core\Lock\LockBackendInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Provides a configuration import form.
+ */
+class ConfigAdminImportForm implements FormInterface, ControllerInterface {
+
+  /**
+   * The storage used to import configuration from.
+   *
+   * @var \Drupal\Core\Config\StorageInterface
+   */
+  protected $sourceStorage;
+
+  /**
+   * The storage used to write configuration to.
+   *
+   * @var \Drupal\Core\Config\StorageInterface
+   */
+  protected $targetStorage;
+
+  /**
+   * A lock backend instance.
+   *
+   * @var \Drupal\Core\Lock\LockBackendInterface
+   */
+  protected $lock;
+
+  /**
+   * Constructs a \Drupal\config\Form\ConfigAdminImportForm object.
+   *
+   * @param \Drupal\Core\Config\StorageInterface $source_storage
+   *   The source storage to retrieve differences from.
+   * @param \Drupal\Core\Config\StorageInterface $target_storage
+   *   The target storage to compare differences to.
+   * @param \Drupal\Core\Config\StorageInterface $lock
+   *   The lock service.
+   */
+  public function __construct(StorageInterface $source_storage, StorageInterface $target_storage, LockBackendInterface $lock) {
+    $this->sourceStorage = $source_storage;
+    $this->targetStorage = $target_storage;
+    $this->lock = $lock;
+  }
+
+  /**
+   * Implements \Drupal\Core\ControllerInterface::create().
+   */
+  public static function create(ContainerInterface $container) {
+    return new static(
+      $container->get('config.storage.staging'),
+      $container->get('config.storage'),
+      $container->get('lock')
+    );
+  }
+
+  /**
+   * Implements \Drupal\Core\Form\FormInterface::getFormID().
+   */
+  public function getFormID() {
+    return 'config_admin_import';
+  }
+
+  /**
+   * Implements \Drupal\Core\Form\FormInterface::buildForm().
+   */
+  public function buildForm(array $form, array &$form_state) {
+    $form['actions'] = array(
+      '#type' => 'actions',
+    );
+    $form['actions']['submit'] = array(
+      '#type' => 'submit',
+      '#value' => t('Import all'),
+    );
+
+    $source_list = $this->sourceStorage->listAll();
+    if (empty($source_list)) {
+      $form['no_changes'] = array(
+        '#markup' => t('There is no configuration to import.'),
+        );
+      $form['actions']['#access'] = FALSE;
+      return $form;
+    }
+
+    $config_changes = config_sync_get_changes($this->sourceStorage, $this->targetStorage);
+    if (empty($config_changes)) {
+      $form['no_changes'] = array(
+        '#markup' => t('There are no configuration changes.'),
+      );
+      return $form;
+    }
+
+    // Add the AJAX library to the form for dialog support.
+    $form['#attached']['library'][] = array('system', 'drupal.ajax');
+
+    foreach ($config_changes as $config_change_type => $config_files) {
+      if (empty($config_files)) {
+        continue;
+      }
+
+      // @todo A table caption would be more appropriate, but does not have the
+      //   visual importance of a heading.
+      $form[$config_change_type]['heading'] = array(
+        '#theme' => 'html_tag__h3',
+        '#tag' => 'h3',
+        );
+      switch ($config_change_type) {
+        case 'create':
+          $form[$config_change_type]['heading']['#value'] = format_plural(count($config_files), '@count new', '@count new');
+          break;
+
+        case 'change':
+          $form[$config_change_type]['heading']['#value'] = format_plural(count($config_files), '@count changed', '@count changed');
+          break;
+
+        case 'delete':
+          $form[$config_change_type]['heading']['#value'] = format_plural(count($config_files), '@count removed', '@count removed');
+          break;
+      }
+      $form[$config_change_type]['list'] = array(
+        '#theme' => 'table',
+        '#header' => array('Name', 'Operations'),
+      );
+
+      foreach ($config_files as $config_file) {
+        $links['view_diff'] = array(
+          'title' => t('View differences'),
+          'href' => 'admin/config/development/sync/diff/' . $config_file,
+          'attributes' => array(
+            'class' => array('use-ajax'),
+          ),
+        );
+        $form[$config_change_type]['list']['#rows'][] = array(
+          'name' => $config_file,
+          'operations' => array(
+            'data' => array(
+              '#type' => 'operations',
+              '#links' => $links,
+            ),
+          ),
+        );
+      }
+    }
+    return $form;
+  }
+
+  /**
+   * Implements \Drupal\Core\Form\FormInterface::validateForm().
+   */
+  public function validateForm(array &$form, array &$form_state) {
+  }
+
+  /**
+   * Implements \Drupal\Core\Form\FormInterface::validateForm().
+   */
+  public function submitForm(array &$form, array &$form_state) {
+    if (!$this->lock->lockMayBeAvailable(CONFIG_IMPORT_LOCK)) {
+      drupal_set_message(t('Another request may be synchronizing configuration already.'));
+    }
+    else if (config_import()) {
+      // Once a sync completes, we empty the staging directory. This prevents
+      // changes from being accidentally overwritten by stray files getting
+      // imported later.
+      foreach ($this->sourceStorage->listAll() as $name) {
+        $this->sourceStorage->delete($name);
+      }
+
+      drupal_flush_all_caches();
+
+      drupal_set_message(t('The configuration was imported successfully.'));
+    }
+    else {
+      drupal_set_message(t('The import failed due to an error. Any errors have been logged.'), 'error');
+    }
+  }
+}