Update to Drupal 8.2.0. For more information, see https://www.drupal.org/project/drupal/releases/8.2.0

core/modules/editor/editor.routing.yml

@@ -2,8 +2,6 @@ editor.filter_xss:
   path: '/editor/filter_xss/{filter_format}'
   defaults:
     _controller: '\Drupal\editor\EditorController::filterXss'
-  options:
-    _theme: ajax_base_page
   requirements:
     _entity_access: 'filter_format.use'
 
@@ -12,7 +10,6 @@ editor.field_untransformed_text:
   defaults:
     _controller: '\Drupal\editor\EditorController::getUntransformedText'
   options:
-    _theme: ajax_base_page
     parameters:
       entity:
         type: entity:{entity_type}
@@ -21,21 +18,17 @@ editor.field_untransformed_text:
     _access_quickedit_entity_field: 'TRUE'
 
 editor.image_dialog:
-  path: '/editor/dialog/image/{filter_format}'
+  path: '/editor/dialog/image/{editor}'
   defaults:
     _form: '\Drupal\editor\Form\EditorImageDialog'
     _title: 'Upload image'
-  options:
-    _theme: ajax_base_page
   requirements:
-    _entity_access: 'filter_format.use'
+    _entity_access: 'editor.use'
 
 editor.link_dialog:
-  path: '/editor/dialog/link/{filter_format}'
+  path: '/editor/dialog/link/{editor}'
   defaults:
     _form: '\Drupal\editor\Form\EditorLinkDialog'
     _title: 'Add link'
-  options:
-    _theme: ajax_base_page
   requirements:
-    _entity_access: 'filter_format.use'
+    _entity_access: 'editor.use'