reverted:
--- b/core/modules/config/lib/Drupal/config/Form/ConfigImportForm.php
+++ a/core/modules/config/lib/Drupal/config/Form/ConfigImportForm.php
@@ -11,7 +11,6 @@
 use Drupal\Core\Form\FormBase;
 use Drupal\Component\Archiver\ArchiveTar;
 use Symfony\Component\DependencyInjection\ContainerInterface;
-use Drupal\Core\Config\StorageComparer;
 
 /**
  * Defines the configuration import form.
@@ -31,10 +30,8 @@
    * @param \Drupal\Core\Config\StorageInterface $config_storage
    *   The configuration storage.
    */
+  public function __construct(StorageInterface $config_storage) {
-  public function __construct(StorageInterface $config_storage, StorageInterface $config_storage_snapshot, StorageInterface $config_storage_active) {
     $this->configStorage = $config_storage;
-    $this->configStorageSnapshot = $config_storage_snapshot;
-    $this->configStorageActive = $config_storage_active;
   }
 
   /**
@@ -42,9 +39,7 @@
    */
   public static function create(ContainerInterface $container) {
     return new static(
+      $container->get('config.storage.staging')
-      $container->get('config.storage.staging'),
-      $container->get('config.storage.snapshot'),
-      $container->get('config.storage')
     );
   }
 
@@ -59,15 +54,6 @@
    * {@inheritdoc}
    */
   public function buildForm(array $form, array &$form_state) {
-    $active_snapshot_comparer = new StorageComparer($this->configStorageActive, $this->configStorageSnapshot);
-
-    // Verify that we have an initial snapshot that matches the active
-    // configuration.
-    if ($active_snapshot_comparer->createChangelist()->hasChanges()) {
-      drupal_set_message($this->t('Changes have been made to your active configuration, which might be lost on the next import attempt. You can find and review the differences between snapshot and active/staging storage here: <a href="@link">Compare snapshot and active/staging storage</a>.', array(
-        '@link' => $this->url('config.snapshot_diff', array('storage' => 'active')))), 'warning');
-    }
-
     $form['description'] = array(
       '#markup' => '<p>' . $this->t('Use the upload button below.') . '</p>',
     );
diff -u b/core/modules/config/lib/Drupal/config/Tests/ConfigExportImportUITest.php b/core/modules/config/lib/Drupal/config/Tests/ConfigExportImportUITest.php
--- b/core/modules/config/lib/Drupal/config/Tests/ConfigExportImportUITest.php
+++ b/core/modules/config/lib/Drupal/config/Tests/ConfigExportImportUITest.php
@@ -145,11 +145,6 @@
     $this->assertText('Changes have been made to your active configuration, which might be lost on the next import attempt. ' .
       'You can find and review the differences between snapshot and active/staging storage here');
 
-    $this->drupalGet('admin/config/development/configuration/full/import');
-
-    $this->assertText('Changes have been made to your active configuration, which might be lost on the next import attempt. ' .
-      'You can find and review the differences between snapshot and active/staging storage here');
-
     $this->clickLink('Compare snapshot and active/staging storage');
     $this->assertText('View changes between snapshot and active configuration');
     $this->assertText('system.site');