Bug 1570812 - Disable browser_dynamical_window_rounding.js on mac for frequent failures. r=jmaher

Differential Revision: https://phabricator.services.mozilla.com/D70849

--HG--
extra : moz-landing-system : lando

browser/components/resistfingerprinting/test/browser/browser.ini

@@ -12,6 +12,7 @@ support-files =
 
 [browser_block_mozAddonManager.js]
 [browser_dynamical_window_rounding.js]
+skip-if = (os == "mac") #Bug 1570812
 [browser_navigator.js]
 [browser_netInfo.js]
 [browser_performanceAPI.js]