Bug 1573511 - Disable test_ext_webRequest_cached.js for permafailing r=jmaher

Differential Revision: https://phabricator.services.mozilla.com/D43008

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

toolkit/components/extensions/test/xpcshell/xpcshell-common.ini

@@ -154,7 +154,7 @@ skip-if = true # Too frequent intermittent failures
 [test_ext_webRequest_auth.js]
 skip-if = os == "android" && debug
 [test_ext_webRequest_cached.js]
-skip-if = os == "android" && debug
+skip-if = os == "android" && processor != "x86_64" # Bug 1573511
 [test_ext_webRequest_filterResponseData.js]
 skip-if = os == "android" && debug
 [test_ext_webRequest_incognito.js]