Part of #1971384: [META] Convert page callbacks to controllers
For instructions on how to convert a page callback into a controller, see the WSCCI Conversion Guide.
wont fix for now#1988802: [META] Rewrite test modules in system to provide better unit testing.
Working on this as part of London sprint.
Please, take a look patch.
The last submitted patch, drupal-1987578-5.patch, failed testing.
Moved to #1987572: Convert session_test callbacks to a new style controller
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