Merge pull request rails#6075 from arunagw/warning_removed_unused_variable

railties variable is not required here.

Author: jeremy

railties/test/railties/engine_test.rb

@@ -86,7 +86,6 @@ def up
       add_to_config "ActiveRecord::Base.timestamped_migrations = false"
 
       boot_rails
-      railties = Rails.application.railties.all.map(&:railtie_name)
 
       Dir.chdir(app_path) do
         output = `bundle exec rake bukkits:install:migrations`