Mark SettingsLanguagesPageBrowserTest.LanguagesPage flaky on Windows

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

Index: chrome/test/data/webui/settings/languages_page_browsertest.js
diff --git a/chrome/test/data/webui/settings/languages_page_browsertest.js b/chrome/test/data/webui/settings/languages_page_browsertest.js
index df6b84a179a201ac8700fc77ffe638361aa16fe4..5307e48eadd56caa98fe0e217313a5d6bc154620 100644
--- a/chrome/test/data/webui/settings/languages_page_browsertest.js
+++ b/chrome/test/data/webui/settings/languages_page_browsertest.js
@@ -31,10 +31,11 @@ SettingsLanguagesPageBrowserTest.prototype = {
   },
 };
 
+// Flaky on Windows. See https://crbug.com/641400.
 // May time out on debug builders and memory bots because
 // the Settings page can take several seconds to load in a Release build
 // and several times that in a Debug build. See https://crbug.com/558434.
-GEN('#if defined(MEMORY_SANITIZER) || !defined(NDEBUG)');
+GEN('#if defined(OS_WINDOWS) || defined(MEMORY_SANITIZER) || !defined(NDEBUG)');
 GEN('#define MAYBE_LanguagesPage DISABLED_LanguagesPage');
 GEN('#else');
 GEN('#define MAYBE_LanguagesPage LanguagesPage');