Remove theme_link from system.performance.yml

Looks like it should also be removed from system.schema.yml and possibly probably system.install:

/**
 * Move system theme settings from variable to config.
 *
 * @ingroup config_upgrade
 */
function system_update_8043() {
  update_variables_to_config('system.performance', array(
    'theme_link' => 'theme_link',
  ));
}

Working on this at the NJ Drupal Code Sprint.

Patch includes changes to system.performance.yml, system.schema.yml, and system.install.

New patch with only the change to system.performance.yml

The patch doesn't apply.

I think we should go back to the patch in #3 and try to re-roll that one. We shouldn't leave a useless upgrade path or useless schema lying around.

Here is the patch that also remove from system.schema.yml and system.install.

I could not find any other instance/usage of that·

RTBC +1