Bug 1282795 - Make frontend::Parser final to silence some -Wdelete-non-virtual-dtor warnings caused by Maybe<Parser>. r=froydnj

--HG--
extra : rebase_source : 6c4eeb1c68c6a1b4e4e7bc232ed2fed7ddddce28

js/src/frontend/Parser.h

@@ -391,7 +391,7 @@ enum DefaultHandling { NameRequired, AllowDefaultName };
 enum TripledotHandling { TripledotAllowed, TripledotProhibited };
 
 template <typename ParseHandler>
-class Parser : private JS::AutoGCRooter, public StrictModeGetter
+class Parser final : private JS::AutoGCRooter, public StrictModeGetter
 {
     class MOZ_STACK_CLASS AutoPushStmtInfoPC
     {