Bug 1523800 - Update LSan whitelist for html/browsers/offline/introduction-4. r=jgraham

Differential Revision: https://phabricator.services.mozilla.com/D18127

--HG--
extra : moz-landing-system : lando

testing/web-platform/meta/html/browsers/offline/introduction-4/__dir__.ini

@@ -1 +1 @@
-lsan-allowed: [Alloc, alloc_system::platform::_$LT$impl$u20$core..alloc..GlobalAlloc$u20$for$u20$alloc_system..System$GT$::alloc, alloc_system::platform::_$LT$impl$u20$core..alloc..GlobalAlloc$u20$for$u20$alloc_system..System$GT$::realloc, mozilla::dom::ChromeUtils::GenerateQI]
+lsan-allowed: [Alloc, alloc_system::platform::_$LT$impl$u20$core..alloc..GlobalAlloc$u20$for$u20$alloc_system..System$GT$::alloc, alloc_system::platform::_$LT$impl$u20$core..alloc..GlobalAlloc$u20$for$u20$alloc_system..System$GT$::realloc, mozilla::dom::ChromeUtils::GenerateQI, std::sys::unix::alloc::_$LT$impl$u20$core..alloc..GlobalAlloc$u20$for$u20$std..alloc..System$GT$::realloc, std::sys::unix::alloc::_$LT$impl$u20$core..alloc..GlobalAlloc$u20$for$u20$std..alloc..System$GT$::alloc]