Bug 1670214 - [Fission] Crash in [@ mozilla::dom::CanonicalBrowsingContext::NotifyOnHistoryReload], r=jesup

Trying to keep the old behavior where reload succeeds without shistory
https://hg.mozilla.org/mozilla-central/file/a42aa95147941ca7983eaf4846b644e207de24f8/docshell/base/nsDocShell.cpp#l4091

Differential Revision: https://phabricator.services.mozilla.com/D93331

docshell/base/CanonicalBrowsingContext.cpp

@@ -527,7 +527,10 @@ void CanonicalBrowsingContext::NotifyOnHistoryReload(
     Maybe<bool>& aReloadActiveEntry) {
   MOZ_DIAGNOSTIC_ASSERT(!aLoadState);
 
+  aCanReload = true;
   nsISHistory* shistory = GetSessionHistory();
+  NS_ENSURE_TRUE_VOID(shistory);
+
   shistory->NotifyOnHistoryReload(&aCanReload);
   if (!aCanReload) {
     return;