Bug 1209184: Follow-up: Disable WebExtension xpcshell tests on Android and gonk. r=me

--HG--
extra : commitid : BAyWC1DtflD
extra : amend_source : 60f56b9557b55bc67189d52692311f1af309dfc5

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

@@ -1,5 +1,6 @@
 [DEFAULT]
 head = head.js
 tail =
+skip-if = toolkit == 'android' || toolkit == 'gonk'
 
 [test_locale_converter.js]