[tor-bugs] #16715 [Tor Browser]: use ThreadsafeIsCallerChrome() instead of IsCallerChrome()

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#16715: use ThreadsafeIsCallerChrome() instead of IsCallerChrome()
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     Reporter:  mcs      |      Owner:  mcs
         Type:  defect   |     Status:  closed
     Priority:  normal   |  Milestone:
    Component:  Tor      |    Version:
  Browser                |   Keywords:  ff38-esr, tbb-5.0,
   Resolution:  fixed    |  TorBrowserTeam201508R
Actual Points:           |  Parent ID:  #14205
       Points:           |
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Comment (by arthuredelstein):

 In the case of #4755 , Kathy's patch has already landed in mozilla-
 central:

 https://dxr.mozilla.org/mozilla-
 central/rev/d6ea652c579992daa9041cc9718bb7c6abefbc91/dom/events/Event.cpp#889

 Should we attempt to merge this fix? Is there a situation where an Event
 object can be accessed from outside the main thread?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16715#comment:5>
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