Remove prototype_legacy_helper
it is only used in unused code + test./app/helpers/wikis/diffs_helper.rb and in a test:
extensions/pages/wiki_page/test/functional/wiki/diffs_controller_test.rb`
it is only used in unused code + test./app/helpers/wikis/diffs_helper.rb and in a test:
extensions/pages/wiki_page/test/functional/wiki/diffs_controller_test.rb`