Bug 1161564 - Re-enable browser_CTP_iframe test now that it has been rewritten. r=jimm

--HG--
extra : rebase_source : 572132f72085f0fcdd5a33323e868c00eaa437e7

browser/base/content/test/plugins/browser.ini

@@ -56,7 +56,6 @@ skip-if = !crashreporter
 [browser_CTP_drag_drop.js]
 [browser_CTP_hide_overlay.js]
 [browser_CTP_iframe.js]
-skip-if = os == 'linux' || os == 'mac' # Bug 984821
 [browser_CTP_multi_allow.js]
 [browser_CTP_nonplugins.js]
 [browser_CTP_notificationBar.js]