Use drop-down UI for "add language".

chrome/browser/resources/options/language_add_language_overlay.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 ///////////////////////////////////////////////////////////////////////////////
 // AddLanguageOverlay class:
 
 cr.define('options', function() {
   /** @const */ var OptionsPage = options.OptionsPage;
 
@@ skipping 26 matching lines @@
         OptionsPage.closeOverlay();
       };
 
       // Create the language list with which users can add a language.
       var addLanguageList = $('add-language-overlay-language-list');
       var languageListData = loadTimeData.getValue('languageList');
       for (var i = 0; i < languageListData.length; i++) {
         var language = languageListData[i];
         var displayText = language.displayName;
         // If the native name is different, add it.
-        if (language.displayName != language.nativeDisplayName) {
+        if (language.displayName != language.nativeDisplayName)
           displayText += ' - ' + language.nativeDisplayName;
-        }
 
-        if (cr.isChromeOS) {
-          var button = document.createElement('button');
-          button.className = 'link-button';
-          button.textContent = displayText;
-          button.languageCode = language.code;
-          var li = document.createElement('li');
-          li.languageCode = language.code;
-          li.appendChild(button);
-          addLanguageList.appendChild(li);
-        } else {
-          var option = document.createElement('option');
-          option.value = language.code;
-          option.textContent = displayText;
-          addLanguageList.appendChild(option);
-        }
+        var option = cr.doc.createElement('option');
+        option.value = language.code;
+        option.textContent = displayText;
+        addLanguageList.appendChild(option);
       }
     },
   };
 
   return {
     AddLanguageOverlay: AddLanguageOverlay
   };
 });