Bug 1262051 - Enable browser_discovery.js on e10s. r=Mossop

--HG--
extra : transplant_source : %FB%A16%7F%CB%8EG%DE_%CB9%22%D3%25%F9%C4%DF%2A%0F%01

toolkit/mozapps/extensions/test/browser/browser-common.ini

@@ -36,7 +36,6 @@ skip-if = true # Bug 1093190 - Disabled due to leak
 [browser_bug590347.js]
 [browser_details.js]
 [browser_discovery.js]
-skip-if = e10s # Bug ?????? - test times out on try on all platforms, but works locally for markh!
 [browser_dragdrop.js]
 skip-if = buildapp == 'mulet'
 [browser_experiments.js]