Bug 1629700 - Update expectancy for manifest-utf8-with-bom.https.html on mac r=egao

Differential Revision: https://phabricator.services.mozilla.com/D72074

testing/web-platform/meta/origin-policy/bad-server/manifest-utf8-with-bom.https.html.ini

@@ -5,6 +5,8 @@
     if (os == "win") and webrender and debug: ["OK", "TIMEOUT"]
     if (os == "win") and webrender and not debug: ["OK", "TIMEOUT"]
     if (os == "win") and not webrender and not debug: ["OK", "TIMEOUT"]
+    if (os == "mac") and not debug and not asan: ["OK", "TIMEOUT"]
+
   [Expected originPolicyIDs check]
     expected: FAIL