Bug 1311239 - Intermittent dom/security/test/hsts/browser_hsts-priming_hsts_after_mixed.js. temporarily disable. r=gbrown

MozReview-Commit-ID: EWCAOjebfcH

dom/security/test/hsts/browser.ini

@@ -11,6 +11,7 @@ support-files =
 [browser_hsts-priming_allow_active.js]
 [browser_hsts-priming_block_active.js]
 [browser_hsts-priming_hsts_after_mixed.js]
+skip-if = os == "linux" # Bug 1311239
 [browser_hsts-priming_allow_display.js]
 [browser_hsts-priming_block_display.js]
 [browser_hsts-priming_block_active_css.js]