Disable many tests with flaky accessibility audits.

chrome/browser/ui/webui/options/browser_options_browsertest.js

Index: chrome/browser/ui/webui/options/browser_options_browsertest.js
diff --git a/chrome/browser/ui/webui/options/browser_options_browsertest.js b/chrome/browser/ui/webui/options/browser_options_browsertest.js
index b5713f60ca6b113fffd262491b6b8c80d3a7e24b..e003871be39decd7de4cd917a1c24d3a224dd7ad 100644
--- a/chrome/browser/ui/webui/options/browser_options_browsertest.js
+++ b/chrome/browser/ui/webui/options/browser_options_browsertest.js
@@ -118,7 +118,8 @@ AdvancedSettingsWebUITest.prototype = {
 };
 
 // TODO(crbug.com/617066) Flakes on Win.
-GEN('#if defined(OS_WIN)');
+// TODO(crbug.com/657514) Flakes on linux and chromeos too.
+GEN('#if defined(OS_WIN) || defined(OS_LINUX) || defined(OS_CHROMEOS)');
 GEN('#define MAYBE_testAdvancedSettingsShown ' +
     'DISABLED_testAdvancedSettingsShown');
 GEN('#else');