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..8ab2b96b78e9ef73f1b8885e78d8b3b5f860cd35 100644
--- a/chrome/browser/resources/options/managed_user_import.js
+++ b/chrome/browser/resources/options/managed_user_import.js
@@ -50,7 +50,8 @@ cr.define('options', function() {
           return;
 
         $('managed-user-import-ok').disabled =
-            managedUserList.selectedItem.onCurrentDevice;
+            managedUserList.selectedItem.onCurrentDevice ||
+            managedUserList.selectedItem.nameConflict;
       });
 
       var self = this;
@@ -75,7 +76,7 @@ cr.define('options', function() {
      * @override
      */
     didShowPage: function() {
-      options.ManagedUserListData.requestExistingManagedUsers(
+      options.ManagedUserListData.requestExistingManagedUsers().then(
           this.receiveExistingManagedUsers_, this.onSigninError_.bind(this));
 
       this.updateImportInProgress_(false);
@@ -167,12 +168,17 @@ 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);
       });