[tor-bugs] #7637 [TorBrowserButton]: Alter "New Identity" to make use of onCacheEntryDoomed

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#7637: Alter "New Identity" to make use of onCacheEntryDoomed
------------------------------+---------------------------------------------
 Reporter:  mikeperry         |          Owner:  mikeperry
     Type:  enhancement       |         Status:  new      
 Priority:  normal            |      Milestone:           
Component:  TorBrowserButton  |        Version:           
 Keywords:                    |         Parent:  #7248    
   Points:                    |   Actualpoints:           
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 One of our Firefox patches is a horrible hack that makes
 nsCacheService::EvictEntries synchronous. We did this because Mozilla made
 it Async before providing an observer to notify us that the eviction took
 place. This allowed evercookies to persist for a short time after New
 Identity (see #5715).

 Apparently, we should now be able to listen to
 https://developer.mozilla.org/en-
 US/docs/XPCOM_Interface_Reference/nsICacheListener#onCacheEntryDoomed().

 Unless of course "doomed" means "We're really going to delete it soon, we
 swear. But we'd like to give content a few more chances to access it
 first, just in case they really wanted to recover their evercookies."

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/7637>
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