Merge branch 'issue_3598' into 'master'

Remove accidentally added line.

Reference: #3598 

See merge request !1858

app/workers/repository_import_worker.rb

@@ -51,8 +51,5 @@ class RepositoryImportWorker
     end
 
     project.import_finish
-
-    # Explicitly update mirror so that upstream remote is created and fetched
-    project.update_mirror
   end
 end