Disable many tests with flaky accessibility audits.

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

Index: chrome/browser/ui/webui/options/settings_format_browsertest.js
diff --git a/chrome/browser/ui/webui/options/settings_format_browsertest.js b/chrome/browser/ui/webui/options/settings_format_browsertest.js
index a84873fede6c6fc9bf21daf388af0de1e08609b7..7c406b3cfe65c573d13defbd53189a71ec5115d5 100644
--- a/chrome/browser/ui/webui/options/settings_format_browsertest.js
+++ b/chrome/browser/ui/webui/options/settings_format_browsertest.js
@@ -132,7 +132,13 @@ SettingsFormatWebUITest.prototype = {
 /**
  * Ensure that radio and checkbox buttons have consistent layout.
  */
-TEST_F('SettingsFormatWebUITest', 'RadioCheckboxStyleCheck', function() {
+// TODO(crbug.com/657514) Flakes on linux and chromeos.
+GEN('#if defined(OS_LINUX) || defined(OS_CHROMEOS)');
+GEN('#define MAYBE_RadioCheckboxStyleCheck DISABLED_RadioCheckboxStyleCheck');
+GEN('#else');
+GEN('#define MAYBE_RadioCheckboxStyleCheck RadioCheckboxStyleCheck');
+GEN('#endif  // defined(OS_WIN)');
+TEST_F('SettingsFormatWebUITest', 'MAYBE_RadioCheckboxStyleCheck', function() {
   var settings = $('settings');
   assertTrue(settings != null, 'Unable to access settings');
   var query = 'input[type=checkbox], input[type=radio]';