[tbb-bugs] #22554 [Applications/Tor Browser]: Remove Battery API related bit in Torbutton

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#22554: Remove Battery API related bit in Torbutton
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     Reporter:  gk                        |      Owner:  tbb-team
         Type:  defect                    |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:  tbb-torbutton
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
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 In #5293 we removed the Battery API preference (`dom.battery.enabled`)
 from our custom prefs file, `000-tor-browser.js`. The rationale was that
 Mozilla made the preference accessible only by non-webcontent (see:
 https://bugzilla.mozilla.org/show_bug.cgi?id=1313580) and we therefore
 don't need to set it ourselves anymore.

 We missed that Torbutton is dealing with the pref as well. We should
 remove that bit, too.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22554>
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