Backed out changeset f9a4c8d67be3 (bug 1582892) for build bustage at build/src/dom/console/ConsoleInstance. On a CLOSED TREE

toolkit/components/extensions/ExtensionPolicyService.cpp

@@ -350,13 +350,12 @@ nsresult ExtensionPolicyService::InjectContentScripts(
           DocInfo docInfo(win);
 
           using RunAt = dom::ContentScriptRunAt;
-          namespace RunAtValues = dom::ContentScriptRunAtValues;
           using Scripts = AutoTArray<RefPtr<WebExtensionContentScript>, 8>;
 
-          Scripts scripts[RunAtValues::Count];
+          constexpr uint8_t n = uint8_t(RunAt::EndGuard_);
+          Scripts scripts[n];
 
           auto GetScripts = [&](RunAt aRunAt) -> Scripts&& {
-            static_assert(sizeof(aRunAt) == 1, "Our cast is wrong");
             return std::move(scripts[uint8_t(aRunAt)]);
           };