Bug 1450864 - Disable on Linux for frequent failures in content-security-policy/navigate-to/child-navigates-parent-blocked.html. r=jmaher

--HG--
extra : rebase_source : 2f2c6c5b8ab1d105bd8b699678a6e96da5add6d9

testing/web-platform/meta/content-security-policy/navigate-to/child-navigates-parent-blocked.html.ini

@@ -1,4 +1,5 @@
 [child-navigates-parent-blocked.html]
+  disabled: if not debug && (os == "linux") https://bugzilla.mozilla.org/show_bug.cgi?id=1450864
   [Test that the child can't navigate the parent because the relevant policy belongs to the navigation initiator (in this case the child)]
     expected: FAIL