Bug 1415037 - Disable browser_siteData.js on linux and osx for frequent failures. r=jmaher

browser/components/preferences/in-content/tests/siteData/browser.ini

@@ -9,7 +9,7 @@ support-files =
 
 [browser_clearSiteData.js]
 [browser_siteData.js]
-skip-if = (os == 'linux' && debug) || verify # Bug 1439332 and bug 1436395
+skip-if = (os == 'linux') || (os == 'mac' && !debug) || verify # Bug 1439332, Bug 1436395, Bug 1415037
 [browser_siteData2.js]
 [browser_siteData3.js]
 [browser_siteData_multi_select.js]