Update to Drupal 8.1.0. For more information, see https://www.drupal.org/drupal-8.1.0-release-notes

core/modules/file/config/schema/file.destination.schema.yml

@@ -1,10 +0,0 @@
-migrate.destination.entity:file:
-  type: migrate_destination
-  label: 'File'
-  mapping:
-    source_path_property:
-      type: string
-      label: 'Source path'
-    urlencode:
-      type: boolean
-      label: 'Whether to urlencode incoming file paths'

core/modules/file/config/schema/file.schema.yml

@@ -121,11 +121,3 @@ field.formatter.settings.file_extension:
     extension_detect_tar:
       type: boolean
       label: 'Detect tar'
-
-migrate.source.d6_upload_instance:
-  type: migrate_source_sql
-  label: 'Drupal 6 upload form display'
-  mapping:
-    constants:
-      type: migrate_entity_constant
-      label: 'Constants'