only in patch2:
unchanged:
--- a/core/modules/block/block.module
+++ b/core/modules/block/block.module
@@ -395,9 +395,6 @@ function template_preprocess_block(&$variables) {
   $variables['attributes']['class'][] = 'block';
   $variables['attributes']['class'][] = drupal_html_class('block-' . $variables['configuration']['provider']);
 
-  // Add default class for block content.
-  $variables['content_attributes']['class'][] = 'content';
-
   // Create a valid HTML ID and make sure it is unique.
   if ($id = $variables['elements']['#block']->id()) {
     $variables['attributes']['id'] = drupal_html_id('block-' . $id);
only in patch2:
unchanged:
--- a/core/modules/search/search.module
+++ b/core/modules/search/search.module
@@ -134,7 +134,7 @@ function search_permission() {
 function search_preprocess_block(&$variables) {
   if ($variables['plugin_id'] == 'search_form_block') {
     $variables['attributes']['role'] = 'search';
-    $variables['content_attributes']['class'][] = 'container-inline';
+    $variables['attributes']['class'][] = 'container-inline';
   }
 }