Disable CrSettingsMainPageTest.All on chrome os

chrome/test/data/webui/settings/cr_settings_browsertest.js

Index: chrome/test/data/webui/settings/cr_settings_browsertest.js
diff --git a/chrome/test/data/webui/settings/cr_settings_browsertest.js b/chrome/test/data/webui/settings/cr_settings_browsertest.js
index 11ec1b9e9f5d511f39fa0714f7afbc0d7bda2328..b803de8c1f99b2ea2cd36637d299a03670e74e4b 100644
--- a/chrome/test/data/webui/settings/cr_settings_browsertest.js
+++ b/chrome/test/data/webui/settings/cr_settings_browsertest.js
@@ -877,7 +877,7 @@ TEST_F('CrSettingsRouteDynamicParametersTest', 'MAYBE_All', function() {
 });
 
 // Times out on Windows Tests (dbg). See https://crbug.com/651296.
-GEN('#if defined(OS_WIN)');
+GEN('#if defined(OS_WIN) || defined(OS_CHROMEOS)');
 GEN('#define MAYBE_MainPage_All DISABLED_All');
 GEN('#else');
 GEN('#define MAYBE_MainPage_All All');