Bug 1404172: Follow-up: Temporarilly disable broken test.

MozReview-Commit-ID: EqWP1pXImm5

toolkit/components/extensions/test/mochitest/chrome.ini

@@ -34,6 +34,7 @@ skip-if = os == 'android' # Bug 1350559
 [test_chrome_ext_webrequest_errors.html]
 [test_chrome_ext_webrequest_host_permissions.html]
 [test_chrome_ext_webrequest_mozextension.html]
+skip-if = true # Bug 1404172
 [test_chrome_native_messaging_paths.html]
 skip-if = os != "mac" && os != "linux"
 [test_ext_cookies_expiry.html]