Update to Drupal 8.0.0 beta 14. For more information, see https://drupal.org/node/2544542

core/modules/system/config/install/system.filter.yml

@@ -1,14 +0,0 @@
-protocols:
-  - http
-  - https
-  - ftp
-  - news
-  - nntp
-  - tel
-  - telnet
-  - mailto
-  - irc
-  - ssh
-  - sftp
-  - webcal
-  - rtsp

core/modules/system/config/schema/system.schema.yml

@@ -126,17 +126,6 @@ system.diff:
           type: integer
           label: 'Number of trailing lines in a diff'
 
-system.filter:
-  type: config_object
-  label: 'Filter settings'
-  mapping:
-    protocols:
-      type: sequence
-      label: 'Allowed protocols'
-      sequence:
-        type: string
-        label: 'Protocol'
-
 system.logging:
   type: config_object
   label: 'Logging settings'