Bug 1529824 - Disable browser_aboutdebugging_serviceworker_fetch_flag.js on mac, win debug and linux 64 for frequent failures. r=egao

Differential Revision: https://phabricator.services.mozilla.com/D50748

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

devtools/client/aboutdebugging/test/browser/browser.ini

@@ -90,6 +90,7 @@ skip-if = debug
 [browser_aboutdebugging_select_network_runtime.js]
 [browser_aboutdebugging_select_page_with_serviceworker.js]
 [browser_aboutdebugging_serviceworker_fetch_flag.js]
+skip-if = debug && (os == "win") || (os == "mac") || (os == "linux" && bits == 64) #Bug 1529824
 [browser_aboutdebugging_serviceworker_multie10s.js]
 skip-if = debug || asan || serviceworker_e10s # Frequent intermittent failures, Bug 1527224
 [browser_aboutdebugging_serviceworker_not_compatible.js]