[tor-bugs] #20680 [Applications/Tor Browser]: Rebase Tor Browser patches to 52 ESR

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#20680: Rebase Tor Browser patches to 52 ESR
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 Reporter:  arthuredelstein                      |          Owner:  tbb-
                                                 |  team
     Type:  defect                               |         Status:  new
 Priority:  Medium                               |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  ff52-esr, tbb-7.0-must,              |  Actual Points:
  TorBrowserTeam201703, tbb-7.0-must-nightly     |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
                                                 |  Sponsor4
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Comment (by mcs):

 Replying to [comment:35 gk]:
 > Here is the next batch:
 >
 > `43d4fc730a6216433c059345111c5fe9d11deae6`: looks good to me. mcs/brade
 could you have a second look?

 We have a couple of small comments:
 * In `dom/base/nsObjectLoadingContent.cpp`, the `SVGs load as documents,
 but are their own capability` comment should not be added (that comment
 was removed from the Mozilla code because it is no longer applicable).
 * In `parser/html/nsHtml5DocumentBuilder.cpp`, the old patch removed the
 `NS_ASSERTION(ssle, "Node didn't QI to style.");` statement. It seems like
 we still want to remove that since the patched code uses `if (ssle)` to
 handle the now expected case where `ssle` is NULL.

 Also, we could instead backport the fix that Mozilla landed for Firefox
 53: https://bugzilla.mozilla.org/show_bug.cgi?id=1216893
 One problem we see with that approach is that the favicon portion is
 missing upstream (#18602).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20680#comment:39>
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