Bug 1578008 - Disabled browser_window_sizing.js on linux x64 and macos r=jmaher

Differential Revision: https://phabricator.services.mozilla.com/D72520

devtools/client/responsive/test/browser/browser.ini

@@ -93,3 +93,4 @@ tags = devtools geolocation
 [browser_viewport_zoom_toggle.js]
 [browser_window_close.js]
 [browser_window_sizing.js]
+skip-if = (os == 'linux' && bits == 64) || (os == 'mac') #Bug 1578008