[tor-bugs] #20490 [Applications/Tor Browser]: Backport fix for assertion failure due to patch for #20304 (bug 1311275)

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#20490: Backport fix for assertion failure due to patch for #20304 (bug 1311275)
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 Reporter:  gk                                   |          Owner:  tbb-
                                                 |  team
     Type:  task                                 |         Status:
                                                 |  needs_review
 Priority:  Medium                               |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  TorBrowserTeam201610R,               |  Actual Points:
  GeorgKoppen201610                              |
Parent ID:  #14270                               |         Points:
 Reviewer:                                       |        Sponsor:
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Comment (by mcs):

 r=mcs
 This looks good to me.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20490#comment:3>
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