Fix protected branches migration

Author: root

Diff for: db/migrate/20150823030100_migrate_protected_branches_users.rb

@@ -7,7 +7,8 @@ class MigrateProtectedBranchesUsers < ActiveRecord::Migration
   def self.up
     RepositoryProtectedBrancheWrapped.all.each do |protected_branch|
       users = protected_branch.user_list.map { |u| User.find_by_login(u) }.compact.uniq
-      protected_branch.user_ids = users.map(&:id)
+      manager = RepositoryProtectedBranches::MemberManager.new(protected_branch)
+      manager.add_users(users.map(&:id))
     end
     remove_column :repository_protected_branches, :user_list
   end