Use drop-down UI for "add language".

chrome/browser/resources/options/language_options.css

Index: chrome/browser/resources/options/language_options.css
diff --git a/chrome/browser/resources/options/language_options.css b/chrome/browser/resources/options/language_options.css
index fa4adcc703a12c81f8388e74cc5f5694d66c0835..1d95096435a4217bd6b3463a77b30c7c76bb8601 100644
--- a/chrome/browser/resources/options/language_options.css
+++ b/chrome/browser/resources/options/language_options.css
@@ -127,34 +127,6 @@
   z-index: 10;
 }
 
-/* In ChromeOS we present the language choices as a big page of links. */
-<if expr="pp_ifdef('chromeos')">
-#add-language-overlay-language-list {
-  -webkit-column-count: 2;
-  -webkit-column-gap: 20px;
-}
-
-#add-language-overlay-language-list > li > button.link-button {
-  padding-bottom: 8px;
-  padding-top: 8px;
-}
-
-#add-language-overlay-page {
-  width: 800px;
-}
-
-#add-language-overlay-page button.link-button {
-  padding-left: 0;
-  padding-right: 0;
-  text-align: left;
-}
-
-#add-language-overlay-page ul {
-  margin: 0;
-  padding: 0;
-}
-</if>
-
 /* TODO(kochi): This is temporary copy from new_tab.css */
 /* Notification */