Remove unnecessary `window.`s in environments code
Based on the discussion here https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/7690/diffs#note_20022268
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Based on the discussion here https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/7690/diffs#note_20022268