Replace own callback handling with Promises.

chrome/browser/resources/options/managed_user_import.js

Index: chrome/browser/resources/options/managed_user_import.js
diff --git a/chrome/browser/resources/options/managed_user_import.js b/chrome/browser/resources/options/managed_user_import.js
index 0152169cb6be4bc018ee41e72983e626d595bbf6..88fbd22c21505df4d8ef6484b6e170a31889a2c7 100644
--- a/chrome/browser/resources/options/managed_user_import.js
+++ b/chrome/browser/resources/options/managed_user_import.js
@@ -167,12 +167,17 @@ cr.define('options', function() {
      *         name: "Managed User Name",
      *         iconURL: "chrome://path/to/icon/image",
      *         onCurrentDevice: true or false,
+     *         nameConflict: true or false,
      *         needAvatar: true or false
      *       }
      * @private
      */
     receiveExistingManagedUsers_: function(managedUsers) {
       managedUsers.sort(function(a, b) {
+        if (a.onCurrentDevice != b.onCurrentDevice)
+          return a.onCurrentDevice ? 1 : -1;
+        if (a.nameConflict != b.nameConflict)
+          return a.nameConflict ? 1 : -1;
         return a.name.localeCompare(b.name);
       });