[tbb-bugs] #29973 [Applications/Tor Browser]: Remove remaining stopOpenSecuritySettingsObserver() pieces

[Tor Bug Tracker & Wiki]

#29973: Remove remaining stopOpenSecuritySettingsObserver() pieces
-------------------------------------------------+-------------------------
 Reporter:  gk                                   |          Owner:  tbb-
                                                 |  team
     Type:  defect                               |         Status:
                                                 |  needs_review
 Priority:  Medium                               |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  ux-team, GeorgKoppen201904,          |  Actual Points:
  TorBrowserTeam201904R, tbb-8.5-must-alpha      |
Parent ID:  #25658                               |         Points:
 Reviewer:                                       |        Sponsor:
-------------------------------------------------+-------------------------
Changes (by gk):

 * keywords:  ux-team, GeorgKoppen201904, TorBrowserTeam201904, tbb-8.5
     -must-alpha => ux-team, GeorgKoppen201904, TorBrowserTeam201904R,
     tbb-8.5-must-alpha
 * status:  new => needs_review


Comment:

 `bug_29973`
 (https://gitweb.torproject.org/user/gk/torbutton.git/commit/?h=bug_29973&id=409f01d42ffb9efc85c9245f9baa6ea1831003c2)
 in my public `torbutton` repo has the fixup up for review.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29973#comment:1>
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