Bug 1258103 - Disabled test_bug369370.html on Linux. r=jmaher

dom/html/test/mochitest.ini

@@ -536,7 +536,7 @@ skip-if = toolkit == 'android' #bug 811644
 [test_bug340017.xhtml]
 [test_bug359657.html]
 [test_bug369370.html]
-skip-if = toolkit == "android" || toolkit == "windows" # disabled on Windows because of bug 1234520
+skip-if = toolkit == "android" || toolkit == "windows" || os == 'linux' # disabled on Windows because of bug 1234520, disabled on linux bug 1258103
 [test_bug380383.html]
 [test_bug402680.html]
 [test_bug403868.html]