MD User Manager: Hides 'import supervised user' link while loading supervised users.

chrome/browser/resources/md_user_manager/create_profile.js

Index: chrome/browser/resources/md_user_manager/create_profile.js
diff --git a/chrome/browser/resources/md_user_manager/create_profile.js b/chrome/browser/resources/md_user_manager/create_profile.js
index 0ea54959d0211cb99b3787b4b3b5119723669d97..6b2ea4107a23c5a37fc4e789f86ff38255e6eaa0 100644
--- a/chrome/browser/resources/md_user_manager/create_profile.js
+++ b/chrome/browser/resources/md_user_manager/create_profile.js
@@ -484,14 +484,19 @@ Polymer({
   },
 
   /**
-   * Returns True if the import supervised user link should be hidden.
-   * @param {boolean} createInProgress True if create/import is in progress
+   * Returns True if the import existing supervised user link should be hidden.
+   * @param {boolean} createInProgress True if create/import is in progress.
+   * @param {boolean} loadingSupervisedUsers True if supervised users are being
+   *     loaded.
    * @param {number} signedInUserIndex Index of the selected signed-in user.
    * @return {boolean}
    * @private
    */
-  isImportUserLinkHidden_: function(createInProgress, signedInUserIndex) {
-    return createInProgress || !this.signedInUser_(signedInUserIndex);
+  isImportUserLinkHidden_: function(createInProgress,
+                                    loadingSupervisedUsers,
+                                    signedInUserIndex) {
+    return createInProgress || loadingSupervisedUsers ||
+        !this.signedInUser_(signedInUserIndex);
   },
 
   /**