Merge branch 'blackst0ne-rails5-update-middlewares' into 'master'

[Rails5] Pass class references instead of strings to middleware builder

See merge request gitlab-org/gitlab-ce!19729

config/application.rb

@@ -12,6 +12,7 @@ module Gitlab
     require_dependency Rails.root.join('lib/gitlab/redis/shared_state')
     require_dependency Rails.root.join('lib/gitlab/request_context')
     require_dependency Rails.root.join('lib/gitlab/current_settings')
+    require_dependency Rails.root.join('lib/gitlab/middleware/read_only')
     # Settings in config/environments/* take precedence over those specified here.
     # Application configuration should go into files in config/initializers
@@ -175,7 +176,7 @@ module Gitlab
     ENV['GIT_TERMINAL_PROMPT'] = '0'
     # Gitlab Read-only middleware support
-    config.middleware.insert_after ActionDispatch::Flash, '::Gitlab::Middleware::ReadOnly'
+    config.middleware.insert_after ActionDispatch::Flash, ::Gitlab::Middleware::ReadOnly
     config.generators do |g|
       g.factory_bot false

config/environments/test.rb

 Rails.application.configure do
   # Make sure the middleware is inserted first in middleware chain
-  config.middleware.insert_before('ActionDispatch::Static', 'Gitlab::Testing::RequestBlockerMiddleware')
-  config.middleware.insert_before('ActionDispatch::Static', 'Gitlab::Testing::RequestInspectorMiddleware')
+  config.middleware.insert_before(ActionDispatch::Static, Gitlab::Testing::RequestBlockerMiddleware)
+  config.middleware.insert_before(ActionDispatch::Static, Gitlab::Testing::RequestInspectorMiddleware)
   # Settings specified here will take precedence over those in config/application.rb