Bug 1300351 - Disable browser_onbeforeunload_navigation.js on non-debug windows; r=jmaher

docshell/test/browser/browser.ini

@@ -85,6 +85,7 @@ support-files =
 [browser_loadURI.js]
 [browser_multiple_pushState.js]
 [browser_onbeforeunload_navigation.js]
+skip-if = os=='win' && !debug # bug 1300351
 [browser_search_notification.js]
 [browser_tab_touch_events.js]
 [browser_timelineMarkers-01.js]