Bug 1281032 - skip entire directory on non linux. r=Tomcat

MozReview-Commit-ID: 2RdEP1J7sTi

--HG--
extra : rebase_source : f38ff53ec1b9e1e968ff89ead2479ea592ee20a4

browser/components/shell/test/browser.ini

@@ -1,5 +1,6 @@
 [DEFAULT]
+skip-if = os != "linux"
 
 [browser_420786.js]
 [browser_633221.js]
-skip-if = os != "linux"
+

browser/components/shell/test/browser_420786.js

@@ -72,10 +72,6 @@ function onPageLoad() {
 function test() {
   var osString = Cc["@mozilla.org/xre/app-info;1"].
                  getService(Ci.nsIXULRuntime).OS;
-  if (osString != "Linux") {
-    todo(false, "This test is Linux specific for now.");
-    return;
-  }
 
   try {
     // If GSettings is available, then the GConf tests