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