Bug 1667455 - Part 5: Stop importing Services.jsm from chrome-priv JS code,...

Bug 1667455 - Part 5: Stop importing Services.jsm from chrome-priv JS code, top-level single-line cases. r=kmag,webdriver-reviewers,perftest-reviewers,webcompat-reviewers,geckoview-reviewers,extension-reviewers,application-update-reviewers,pip-reviewers,twisniewski,m_kato,jdescottes,mconley,AlexandruIonescu,mossop

Differential Revision: https://phabricator.services.mozilla.com/D150894