Clarify settings UI in multi-profiles mode

chrome/browser/resources/options/language_options.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.
 
 // TODO(kochi): Generalize the notification as a component and put it
 // in js/cr/ui/notification.js .
 
 cr.define('options', function() {
   /** @const */ var OptionsPage = options.OptionsPage;
   /** @const */ var LanguageList = options.LanguageList;
@@ skipping 539 matching lines @@
       var uiLanguageMessage = $('language-options-ui-language-message');
       var uiLanguageNotification = $('language-options-ui-notification-bar');
 
       // Remove the event listener and add it back if useful.
       uiLanguageButton.onclick = null;
 
       // Unhide the language button every time, as it could've been previously
       // hidden by a language change.
       uiLanguageButton.hidden = false;
 
+      // Hide the controlled setting indicator.
+      var uiLanguageIndicator = document.querySelector(
+          '.language-options-contents .controlled-setting-indicator');
+      uiLanguageIndicator.removeAttribute('controlled-by');
+
       if (languageCode == this.prospectiveUiLanguageCode_) {
         uiLanguageMessage.textContent =
             loadTimeData.getString('isDisplayedInThisLanguage');
         showMutuallyExclusiveNodes(
             [uiLanguageButton, uiLanguageMessage, uiLanguageNotification], 1);
       } else if (languageCode in loadTimeData.getValue('uiLanguageCodeSet')) {
         if (cr.isChromeOS && UIAccountTweaks.loggedInAsGuest()) {
           // In the guest mode for ChromeOS, changing UI language does not make
           // sense because it does not take effect after browser restart.
           uiLanguageButton.hidden = true;
           uiLanguageMessage.hidden = true;
         } else {
           uiLanguageButton.textContent =
               loadTimeData.getString('displayInThisLanguage');
+
+          if (loadTimeData.getBoolean('secondaryUser')) {
+            uiLanguageButton.disabled = true;
+            uiLanguageIndicator.setAttribute('controlled-by', 'shared');
+          } else {
+            uiLanguageButton.onclick = function(e) {
+              chrome.send('uiLanguageChange', [languageCode]);
+            };
+          }
           showMutuallyExclusiveNodes(
               [uiLanguageButton, uiLanguageMessage, uiLanguageNotification], 0);
-          uiLanguageButton.onclick = function(e) {
-            chrome.send('uiLanguageChange', [languageCode]);
-          };
         }
       } else {
         uiLanguageMessage.textContent =
             loadTimeData.getString('cannotBeDisplayedInThisLanguage');
         showMutuallyExclusiveNodes(
             [uiLanguageButton, uiLanguageMessage, uiLanguageNotification], 1);
       }
     },
 
     /**
@@ skipping 706 matching lines @@
 
   LanguageOptions.onComponentManagerInitialized = function(componentImes) {
     LanguageOptions.getInstance().appendComponentExtensionIme_(componentImes);
   };
 
   // Export
   return {
     LanguageOptions: LanguageOptions
   };
 });