Replace own callback handling with Promises.

chrome/browser/resources/options/managed_user_list.js

Index: chrome/browser/resources/options/managed_user_list.js
diff --git a/chrome/browser/resources/options/managed_user_list.js b/chrome/browser/resources/options/managed_user_list.js
index 4af84c64c14a89d9d0f8e41c5b07f40cadce22dc..85dc31852a6ac3e0d7e6f74bdba8b8656e1c3167 100644
--- a/chrome/browser/resources/options/managed_user_list.js
+++ b/chrome/browser/resources/options/managed_user_list.js
@@ -72,7 +72,7 @@ cr.define('options.managedUserOptions', function() {
       nameElement.textContent = managedUser.name;
       this.appendChild(nameElement);
 
-      if (managedUser.onCurrentDevice) {
+      if (managedUser.onCurrentDevice || managedUser.nameConflict) {
         iconElement.className += ' profile-img-disabled';
         nameElement.className += ' profile-name-disabled';
 
@@ -80,8 +80,9 @@ cr.define('options.managedUserOptions', function() {
         var alreadyOnDeviceElement = this.ownerDocument.createElement('div');
         alreadyOnDeviceElement.className =
             'profile-name-disabled already-on-this-device';
-        alreadyOnDeviceElement.textContent =
-            loadTimeData.getString('managedUserAlreadyOnThisDevice');
+        alreadyOnDeviceElement.textContent = loadTimeData.getString(
+            managedUser.onCurrentDevice ? 'managedUserAlreadyOnThisDevice' :
+                                          'managedUserNameConflict');
         this.appendChild(alreadyOnDeviceElement);
       }
     },