Merge branch 'kerrizor/privatize-oversized_merge_request' into 'master'

Privatize .oversized_merge_request?

See merge request gitlab-org/gitlab!29975

ee/lib/gitlab/code_owners.rb

@@ -54,6 +54,7 @@ module Gitlab
 
       mrd_to_check_for_overflow.overflow?
     end
+    private_class_method :oversized_merge_request?
 
     def self.slow_path_lookup(merge_request, merge_request_diff)
       merge_request_diff ||= merge_request.merge_request_diff