remove the rest of the dead code

app/models/ability.rb

@@ -63,79 +63,5 @@ class Ability
     def uncached_allowed(user, subject)
       BasePolicy.class_for(subject).abilities(user, subject)
     end
-
-    def abilities_by_subject_class(user:, subject:)
-      case subject
-      when ExternalIssue, Deployment, Environment then project_abilities(user, subject.project)
-      else []
-      end + global_abilities(user)
-    end
-
-    # List of possible abilities for anonymous user
-    def anonymous_abilities(subject)
-      if subject.respond_to?(:project)
-        ProjectPolicy.abilities(nil, subject.project)
-      elsif subject.respond_to?(:group)
-        GroupPolicy.abilities(nil, subject.group)
-      else
-        []
-      end
-    end
-
-    def global_abilities(user)
-      rules = []
-      rules << :create_group if user.can_create_group
-      rules << :read_users_list
-      rules
-    end
-
-    def project_abilities(user, project)
-      # temporary patch, deleteme before merge
-      ProjectPolicy.abilities(user, project).to_a
-    end
-
-    def project_member_abilities(user, subject)
-      rules = []
-      target_user = subject.user
-      project = subject.project
-
-      unless target_user == project.owner
-        can_manage = allowed?(user, :admin_project_member, project)
-
-        if can_manage
-          rules << :update_project_member
-          rules << :destroy_project_member
-        elsif user == target_user
-          rules << :destroy_project_member
-        end
-      end
-
-      rules
-    end
-
-    def filter_build_abilities(rules)
-      # If we can't read build we should also not have that
-      # ability when looking at this in context of commit_status
-      %w(read create update admin).each do |rule|
-        rules.delete(:"#{rule}_commit_status") unless rules.include?(:"#{rule}_build")
-      end
-      rules
-    end
-
-    def restricted_public_level?
-      current_application_settings.restricted_visibility_levels.include?(Gitlab::VisibilityLevel::PUBLIC)
-    end
-
-    def filter_confidential_issues_abilities(user, issue, rules)
-      return rules if user.admin? || !issue.confidential?
-
-      unless issue.author == user || issue.assignee == user || issue.project.team.member?(user, Gitlab::Access::REPORTER)
-        rules.delete(:admin_issue)
-        rules.delete(:read_issue)
-        rules.delete(:update_issue)
-      end
-
-      rules
-    end
   end
 end